Mobilemedia Ideas LLC v. Apple Inc. ( 2015 )


Menu:
  •   United States Court of Appeals
    for the Federal Circuit
    ______________________
    MOBILEMEDIA IDEAS LLC,
    Plaintiff-Cross-Appellant
    v.
    APPLE INC.,
    Defendant-Appellant
    ______________________
    2014-1060, 2014-1091
    ______________________
    Appeals from the United States District Court for the
    District of Delaware in No. 1:10-cv-00258-SLR-MPT,
    Judge Sue L. Robinson.
    ______________________
    Decided: March 17, 2015
    ______________________
    STEVEN M. BAUER, Proskauer Rose LLP, Boston, MA,
    argued for plaintiff-cross-appellant. Also represented by
    JUSTIN J. DANIELS, SAFRAZ ISHMAEL, JOHN M. KITCHURA,
    JR., JOHN E. ROBERTS.
    GEORGE ALFRED RILEY, O’Melveny & Myers LLP, San
    Francisco. CA, argued for defendant-appellant. Also
    represented by LUANN LORAINE SIMMONS, MELODY
    DRUMMOND HANSEN, TIM D. BYRON; XIN-YI ZHOU, Los
    Angeles, CA.
    ______________________
    2                       MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    Before TARANTO, BRYSON, and CHEN, Circuit Judges.
    CHEN, Circuit Judge.
    This is a patent infringement case relating to four pa-
    tents owned by plaintiff and cross-appellant MobileMedia
    Ideas LLC (MobileMedia).         Defendant and appellant
    Apple Inc. (Apple) appeals from a final judgment of the
    United States District Court for the District of Delaware
    finding claim 73 of 
    U.S. Patent No. 6,427,078
     (the ’078
    patent) and claim 23 of 
    U.S. Patent No. 6,070,068
     (the
    ’068 patent) to be infringed and not invalid. MobileMedia
    cross-appeals from the district court’s final judgment
    finding claims 5, 6, and 10 of 
    U.S. Patent No. 6,253,075
    (the ’075 patent) and claims 2–4 and 12 of U.S. Patent No.
    RE 39,231 (the ’231 patent) not to be infringed, and
    claims 5, 6, and 10 of the ’075 patent to also be invalid.
    As to Apple’s appeal, we (i) affirm the district court’s
    judgment that claim 73 of the ’078 patent is not invalid,
    (ii) reverse the district court’s judgment that claim 73 of
    the ’078 patent is infringed, and (iii) reverse the district
    court’s judgment that claim 23 of the ’068 patent is not
    invalid. As to MobileMedia’s cross-appeal, we (i) affirm
    the district court’s judgment that claims 5, 6, and 10 of
    the ’075 patent are invalid, (ii) vacate the district court’s
    judgment that claims 2–4 and 12 of the ’231 patent are
    not infringed because the judgment is based on an errone-
    ous claim construction, and (iii) remand to the district
    court for further proceedings.
    I. BACKGROUND
    MobileMedia is a company formed by MPEG LA, LLC,
    Nokia Corporation (Nokia), and Sony Corporation of
    America. MobileMedia filed suit against Apple, asserting
    infringement of sixteen patents by various Apple prod-
    ucts. Apple responded with several affirmative defenses,
    alleging, among other things, invalidity of all sixteen
    patents, and also counterclaimed for declaratory judg-
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                       3
    ments of noninfringement. The district court bifurcated
    the issues of willfulness and damages for purposes of
    discovery and trial. During the course of the ensuing
    litigation, the parties stipulated to a dismissal of the
    claims and counterclaims related to two patents, and
    MobileMedia deferred the resolution of four other patents
    to a later phase of the litigation. The district court then
    granted Apple’s summary judgment motions of nonin-
    fringement or invalidity for five of the remaining patents,
    including Apple’s summary judgment motion of nonin-
    fringement of claims 2–4 and 12 of the ’231 patent.
    MobileMedia Ideas LLC v. Apple Inc., 
    907 F. Supp. 2d 570
    , 627–28 (D. Del. 2012) (MobileMedia SJ). Mo-
    bileMedia then selected claims 5, 6, and 10 of the ’075
    patent, claims 23 and 24 of the ’068 patent, and claim 73
    of the ’078 patent to assert at trial against Apple and its
    accused iPhone 3G, iPhone 3GS, and iPhone 4 products.
    MobileMedia Ideas LLC v. Apple Inc., 
    966 F. Supp. 2d 439
    , 447 (D. Del. 2013) (MobileMedia JMOL). At trial,
    Apple argued that its accused iPhones did not infringe
    any of the asserted claims and that certain combinations
    of prior art references rendered each of the asserted
    claims invalid as obvious under 
    35 U.S.C. § 103
    . The jury
    returned a verdict finding that (i) Apple’s accused prod-
    ucts directly infringed the asserted claims, (ii) Apple did
    not induce infringement of the asserted claims, and (iii)
    none of the asserted claims were invalid as obvious. 
    Id.
    After the district court entered a judgment consistent
    with the jury’s verdict, Apple renewed a previously-filed
    motion for judgment as a matter of law (JMOL) under
    Rule 50(b) of the Federal Rules of Civil Procedure (FRCP),
    and in the alternative, moved for a new trial under FRCP
    59(a). 
    Id.
     The district court granted Apple’s JMOL
    motion of (i) noninfringement and invalidity of all assert-
    ed claims of the ’075 patent, 
    id.
     at 457–59, and (ii) invalid-
    ity of claim 24 of the ’068 patent, 
    id.
     at 464–68. The
    district court denied Apple’s motion with respect to (i)
    4                        MOBILEMEDIA IDEAS LLC    v. APPLE INC.
    invalidity of claim 23 and noninfringement of claims 23
    and 24 of the ’068 patent, 
    id.
     at 464–68, and (ii) invalidity
    and noninfringement of claim 73 of the ’078 patent, 
    id.
     at
    472–74. The district court also denied Apple’s motion for
    a new trial, 
    id.
     at 474–77, and entered a judgment con-
    sistent with its partial grant of Apple’s JMOL motion.
    Joint Appendix (J.A.) 1–5. Both parties agree that the
    district court’s judgment is final except for an accounting,
    which includes the determination of damages and willful
    infringement. See Robert Bosch LLC v. Pylon Mfg. Corp.,
    
    719 F.3d 1305
    , 1320 (Fed. Cir. 2013) (en banc).
    Apple now appeals the district court’s denial of its
    JMOL motion of noninfringement and invalidity of claim
    73 of the ’078 patent and claim 23 of the ’068 patent. In
    particular, Apple challenges (i) the district court’s claim
    construction of two means-plus-function limitations in
    claim 73 of the ’078 patent and one limitation in claim 23
    of the ’068 patent, (ii) the district court’s determination
    that substantial evidence supports the jury’s finding that
    a person having ordinary skill in the art would not have
    been motivated to combine two references to render claim
    73 of the ’078 patent obvious, and (iii) the district court’s
    conclusion that claim 23 of the ’068 patent would not have
    been obvious in view of a prior art reference, together
    with the common knowledge of one skilled in the art.
    For its part, MobileMedia cross-appeals (i) the district
    court’s grant of Apple’s JMOL motion of noninfringement
    and invalidity of claims 5, 6, and 10 of the ’075 patent,
    and (ii) the district court’s grant of summary judgment of
    noninfringement of the ’231 patent. In particular, Mo-
    bileMedia challenges (i) the district court’s finding that
    MobileMedia failed to present evidence that Apple’s
    accused iPhones met a required limitation of the asserted
    claims of the ’075 patent, (ii) the district court’s conclusion
    that no reasonable juror could find the asserted claims of
    the ’075 patent to be nonobvious over the prior art, and
    (iii) the district court’s claim construction of a means-plus-
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     5
    function limitation in the asserted claims of the ’231
    patent.
    Because a party may appeal a judgment that is final
    except for an “accounting,” we have jurisdiction over both
    Apple’s appeal and MobileMedia’s cross-appeal under 
    35 U.S.C. § 1292
    (c)(2).
    II. DISCUSSION
    We review decisions on motions for summary judg-
    ment and JMOL under the law of the regional circuit.
    Energy Transp. Grp. Inc. v. William Demant Holding
    A/S, 
    697 F.3d 1342
    , 1350 (Fed. Cir. 2012). The Third
    Circuit reviews grants and denials of motions for sum-
    mary judgment de novo, applying the same standard of
    review as the district court. Gonzalez v. Sec’y of Dep’t of
    Homeland Sec., 
    678 F.3d 254
    , 257 (3d Cir. 2012). Similar-
    ly, the Third Circuit reviews district court JMOL deci-
    sions de novo. Pitts v. Delaware, 
    646 F.3d 151
    , 155 (3d
    Cir. 2011). We must view the record in the light most
    favorable to the verdict winner, drawing all reasonable
    inferences in its favor. Starceski v. Westinghouse Elec.
    Corp., 
    54 F.3d 1089
    , 1095 (3d Cir. 1995). Only if the
    record is “critically deficient of the minimum quantum of
    evidence” on which a jury could reasonably base its ver-
    dict does the Third Circuit affirm a grant of JMOL. Pitts,
    
    646 F.3d at 155
     (internal citation omitted). JMOL, how-
    ever, may be appropriate when there is a purely legal
    basis required for reversal that does not depend on reject-
    ing the jury’s findings on the evidence at trial. Acumed
    LLC v. Advanced Surgical Servs., Inc., 
    561 F.3d 199
    , 211
    (3d Cir. 2009).
    III. APPLE’S APPEAL
    A. The ’078 patent (camera phone)
    The ’078 patent is directed to a “small-sized, portable
    and hand-held work station,” such as a notebook comput-
    er, that includes a camera unit, a data processing unit, a
    6                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    display, a user interface, and at least one memory unit.
    ’078 patent, Abstract. The specification describes how
    this “notebook computer” uses the attached camera unit
    to take a picture of items such as business cards, hand-
    written text, and figures. 
    Id.
     at 5:15–21 (business cards),
    5:43–45 (circles or lines), and 5:37–38 (handwritten text).
    Software applications, such as graphics and optical char-
    acter recognition (OCR) software, convert the captured
    images into text or rudimentary graphical data for subse-
    quent use by the notebook computer. 
    Id.
     at 5:21–58.
    According to the specification, adding a camera unit to the
    notebook computer allows a user to “scan different written
    and/or drawn information into the memory of the note-
    book computer quickly and easily.” 
    Id.
     at 6:17–20. A
    “digitizer pad” may also be part of the notebook computer,
    which uses “known technique[s]” to recognize input from a
    pen and convert figures drawn on the digitizer pad into
    bitmap images. 
    Id.
     at 7:6–10.
    The notebook computer can include a cellular mobile
    phone unit, which uses “conventional” analog modem or
    digital GSM technology. 
    Id.
     at 3:37–49. Coupled with a
    miniature speaker and microphone, the GSM interface
    allows the notebook computer to “be used in the same way
    as a conventional hand-held telephone.” 
    Id.
     at 3:49–53.
    The notebook computer can also transmit SMS (Short
    Message Service) and e-mail messages through its GSM
    interface. 
    Id.
     at 8:7–17.
    Although the invention is described throughout the
    specification as a “notebook computer,” the specification
    also contemplates that the device “may also be a radiotel-
    ephone.” 
    Id.
     at 8:18–20. Claim 73 of the ’078 patent
    recites such an embodiment of the claimed invention:
    73. A portable cellular mobile phone comprising:
    a built in camera unit for obtaining image infor-
    mation;
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                    7
    a user interface for enabling a user to input sig-
    nals to operate the camera unit;
    a display for presenting image information ob-
    tained by the camera unit;
    a microprocessor adapted to control the operations
    of the camera unit in response to input signals
    from the user interface, and to process image in-
    formation received by the camera unit; and
    means, coupled to said microprocessor, for trans-
    mitting image information processed by said mi-
    croprocessor to another location using a radio
    frequency channel; and
    wherein the camera unit comprises:
    optics for obtaining image information;
    an image sensor for obtaining image infor-
    mation; and
    means for processing and for storing at least a
    portion of the image information obtained by the
    camera unit for later recall and processing.
    
    Id.
     at 16:1–19 (emphasis added).
    1. Invalidity
    Apple contends that the district court erred by deny-
    ing its JMOL motion that the ’078 patent is invalid as
    obvious over two references: Japanese patent application
    publication no. H6-133081 (Kyocera) and 
    U.S. Patent No. 5,550,646
     (Lucent). Kyocera discloses a mobile phone
    with a built-in camera unit, a user interface, and a view-
    finder display. Kyocera, Abstract; J.A. 57596. The cam-
    era unit includes an image sensor that captures image
    data through a lens. Kyocera, ¶ 10; J.A. 57601. Lucent
    discloses a portable phone with an integrated camera
    unit, a keypad interface, and an LCD display. Lucent,
    3:21–33, 4:1–31. The Lucent device includes a micropro-
    8                       MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    cessor that controls camera operations, 
    id.
     at 3:24–29, and
    processes pictures in order to “enhance presentability,” 
    id.
    at 3:47–48. The device stores these pictures in RAM
    memory. 
    Id.
     at 4:32–33, 4:40–42, and 6:46–62. The
    device can then transmit the pictures using a “built-in
    cellular telephone” and fax modem. 
    Id.
     at 2:4–5, 2:61–66,
    and 5:26–47.
    During trial, Apple contended that the Kyocera mo-
    bile phone, together with the microprocessor controlling
    the Lucent device, disclose all limitations of claim 73. 1
    Apple’s expert further testified that the two references
    discuss similar technologies, and a person having ordi-
    nary skill in the art—someone with a Bachelor of Science
    degree in electrical engineering, computer engineering, or
    the equivalent, and between two and four years of experi-
    ence in the field 2—would have understood the benefits
    and cost advantages of combining the references. Mo-
    bileMedia JMOL, 966 F. Supp. 2d at 471. MobileMedia
    responded with testimony from its expert that such a
    skilled artisan would not have been able to combine the
    Lucent microprocessor with the Kyocera mobile phone
    during the relevant time frame due to the “complexity and
    sophistication of software and hardware integration and
    development.” Id. MobileMedia did not present evidence
    of objective indicia of nonobviousness. J.A. 19477–78.
    1   Apple also argued at trial that Kyocera anticipat-
    ed claim 73 of the ’078 patent. MobileMedia contended
    that Kyocera did not disclose a microprocessor or means
    for storing captured images for later recall. The jury
    found that Kyocera did not anticipate claim 73, a finding
    which Apple does not appeal.
    2   The parties agreed on the level of ordinary skill in
    the art.    Compare J.A. 20464 (testimony from Mo-
    bileMedia’s expert), with J.A. 20285–86 (testimony from
    Apple’s expert).
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                      9
    The district court determined that there was no mate-
    rial dispute between the parties at trial that Kyocera and
    Lucent together disclose all the limitations of claim 73.
    MobileMedia JMOL, 966 F. Supp. 2d at 471. The district
    court also found that the “jury implicitly chose to believe”
    the testimony of MobileMedia’s expert instead of the
    testimony of Apple’s expert regarding the alleged motiva-
    tion to combine the two references. Id. at 472. Therefore,
    the district court found that substantial evidence support-
    ed the jury’s verdict that the ’078 patent was not invalid,
    and denied Apple’s JMOL motion.
    On appeal, Apple argues that the combination of the
    Kyocera and Lucent references is merely the predictable
    use of prior art elements according to their established
    functions, and therefore would have been obvious. First,
    Apple contends that Lucent discloses a microprocessor
    that performs signal processing to “enhance presentabil-
    ity” of captured pictures, and that its expert testified that
    a skilled artisan would have recognized that modifying
    Kyocera with Lucent provides the benefit of improved
    picture quality. Second, Apple asserts that the Lucent
    microprocessor can be programmed to provide functionali-
    ty similar to that of the Kyocera mobile phone, and that
    its expert testified that skilled artisans would have un-
    derstood the cost advantages of using a programmable
    microprocessor for the relevant operations of the Kyocera
    mobile phone. Apple also notes that Lucent discloses a
    commercially-available, off-the-shelf microprocessor, and
    that its expert testified that disclosure of such an ordi-
    nary, commercially-available processor would have moti-
    vated those of skill in the art to try—and to expect success
    from using—the Lucent microprocessor with the Kyocera
    mobile phone.
    A patent is invalid as obvious under 
    35 U.S.C. § 103
     if
    the differences between the subject matter sought to be
    patented and the prior art are such that the subject
    matter would have been obvious at the time the invention
    10                       MOBILEMEDIA IDEAS LLC    v. APPLE INC.
    was made to a person having ordinary skill in the art. See
    KSR Int’l Co. v. Teleflex Inc., 
    550 U.S. 398
    , 406–07 (2007).
    Obviousness is a question of law based on underlying
    facts, as set forth in Graham v. John Deere Co. of Kan.
    City, 
    383 U.S. 1
    , 17 (1966). The Graham factors are (i)
    the scope and content of the prior art, (ii) the differences
    between the prior art and the claimed invention, (iii) the
    level of ordinary skill in the field of the invention, and (iv)
    any relevant objective considerations of nonobviousness.
    See 
    id.
     at 17–18. What a particular reference discloses is
    a question of fact, as is the question of whether there was
    a reason to combine certain references. Transocean
    Offshore Deepwater Drilling, Inc. v. Maersk Contractors
    USA, Inc., 
    617 F.3d 1296
    , 1303 (Fed. Cir. 2010). Thus,
    although we review any underlying findings of fact by the
    jury—whether explicit or implicit—for substantial evi-
    dence, the ultimate determination of obviousness is a
    question of law we review de novo. Bos. Scientific Scimed,
    Inc. v. Cordis Corp., 
    554 F.3d 982
    , 990 (Fed. Cir. 2009).
    The existence of a motivation to combine the Kyocera
    and Lucent references was contested by the parties at
    trial. Thus, while Apple may have presented some evi-
    dence to support its position that a skilled artisan would
    have been motivated to combine Kyocera with Lucent,
    this alone does not demonstrate that the jury’s verdict
    was unsupported by substantial evidence.
    At trial, MobileMedia’s expert focused on Kyocera’s
    failure to teach a skilled artisan how to implement the
    claimed “microprocessor adapted to control the operations
    of the camera unit in response to input signals from the
    user interface, and to process image information received
    by the camera unit.” J.A. 20463; ’078 patent, 16:7–10.
    MobileMedia’s expert acknowledged that had the claims
    merely required a processor, “it [would have been] obvious
    to put one there,” but testified that the surrounding claim
    limitations required the microprocessor to “play[] multiple
    roles” and “make [the claimed components] all work
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     11
    together,” which was “a real challenge” in the art at the
    time of the claimed invention. J.A. 20463–64, 204637.
    MobileMedia’s expert noted that Nokia, which at the time
    “was at the very forefront of innovation in the cellphone
    industry,” needed two years to develop a product with a
    microprocessor that provided the claimed functionality
    between a phone and camera. J.A. 20467. In view of
    these considerations, MobileMedia’s expert testified that
    it would not have been obvious for one of skill in the art at
    the time the invention was made (1994), even with
    knowledge of the Lucent microprocessor, to combine the
    Lucent microprocessor with the Kyocera mobile phone in
    a manner that satisfied the limitations of claim 73 of the
    ’078 patent. J.A. 20466–67.
    As the Supreme Court noted in KSR, even when a
    technique has been used to improve a device, and a skilled
    artisan would recognize that it could improve other devic-
    es in the same way, using that technique may not be
    obvious if its actual application is beyond his or her level
    of skill. 
    550 U.S. at 417
    . Here, MobileMedia’s expert
    testified that integrating the Lucent microprocessor to
    control the camera of the Kyocera mobile phone in the
    manner required by the asserted claims would be beyond
    the technical ability of a skilled artisan. This provided
    the jury with a reasonable basis for finding that the
    claimed invention would not have been obvious to one of
    ordinary skill in the art at the relevant timeframe. Alt-
    hough Apple’s expert offered a differing opinion, when
    there is conflicting testimony at trial, and the evidence
    overall does not make only one finding on the point rea-
    sonable, the jury is permitted to make credibility deter-
    minations and believe the witness it considers more
    trustworthy. See Kinetic Concepts, Inc. v. Smith & Neph-
    ew, Inc., 
    688 F.3d 1342
    , 1362 (Fed. Cir. 2012). Here, the
    jury credited the testimony of MobileMedia’s expert over
    the testimony of Apple’s expert. MobileMedia JMOL, 966
    F. Supp. 2d at 472. Where there is substantial evidence
    12                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    for a reasonable jury finding, it is not our function to
    second guess or reevaluate the weight given to that evi-
    dence. See, e.g., Comark Commc’ns, Inc. v. Harris Corp.,
    
    156 F.3d 1182
    , 1192 (Fed. Cir. 1998). Thus, we agree
    with the district court that substantial evidence supports
    the jury’s finding that one of skill in the art would not
    have been motivated to combine the Lucent and Kyocera
    references to arrive at the claimed invention. Conse-
    quently, the district court did not err by denying Apple’s
    motion for JMOL of invalidity.
    2. Noninfringement
    Apple also contends that the district court erred in
    construing two means-plus-function limitations in claim
    73. MobileMedia SJ, 907 F. Supp. 2d at 601. Apple
    contends that the jury’s finding of infringement was based
    on these erroneous constructions, and that when con-
    strued correctly, no reasonable jury could find that Ap-
    ple’s accused iPhones infringe claim 73 of the ’078 patent.
    Both parties agree that claim 73 includes two limita-
    tions that invoke 
    35 U.S.C. § 112
     ¶ 6 3: a “means . . . for
    transmitting image information” and a “means for pro-
    cessing and for storing” this image information. Both
    parties also agree that the “image information” processed
    and transmitted by the two “means” must be obtained
    from the camera unit. Appellant’s Reply Br. 4 n.1; see
    also J.A. 28470–71.
    We turn first to the “means for processing and stor-
    ing.” Apple argues that the district court erred in identi-
    3  Paragraph 6 of 
    35 U.S.C. § 112
     was replaced with
    newly designated § 112(f) when § 4(c) of the America
    Invents Act (AIA), Pub. L. No. 112-29, took effect on
    September 16, 2012. Because the applications resulting
    in the patents at issue in this case were filed before that
    date, we will refer to the pre-AIA version of § 112.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     13
    fying the structure disclosed in the ’078 patent’s specifica-
    tion corresponding to the “means for processing and for
    storing” an image from the camera as any image pro-
    cessing unit in the overall device, rather than the pro-
    cessing and memory units within the camera unit. Apple
    contends that the language of the claim expressly re-
    quires the storing and processing of image data by the
    camera to be performed by the camera’s own processor
    and memory unit, and not by the notebook computer’s
    general purpose central processor. Apple also notes that
    the specification only links the functions of storing and
    processing images captured by the camera with the
    camera’s own processor and memory units.
    MobileMedia responds that the “means for processing
    and storing” are not limited to the camera unit’s processor
    and memory units because nothing in the specification
    indicates that these separate units cannot be used for
    other purposes. Although conceding that the claimed
    device includes a central processor that is separate from
    the processor within the camera unit, MobileMedia ar-
    gues that the means for processing images captured by
    the camera can be either of the disclosed processors.
    Similarly, for the memory units, MobileMedia contends
    that because nothing in the specification suggests that the
    camera’s memory units function solely for the purpose of
    the camera, the means for storing images captured by the
    camera can be the memory units within the camera unit
    or the device’s separate system-level memory unit.
    We review the district court’s claim construction here
    de novo because it relied only on evidence intrinsic to the
    ’078 patent. See Teva Pharm. USA, Inc. v. Sandoz, Inc.,
    
    135 S. Ct. 831
    , 841 (2015). Under 
    35 U.S.C. § 112
     ¶ 6, a
    means-plus-function claim “shall be construed to cover the
    corresponding structure, material, or acts described in the
    specification and equivalents thereof.” A disclosed struc-
    ture is a “corresponding structure” only if the specification
    or prosecution history clearly links or associates that
    14                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    structure to the function recited in the claim. B. Braun
    Med., Inc. v. Abbott Labs., 
    124 F.3d 1419
    , 1424 (Fed. Cir.
    1997).
    Claim 73 recites a portable cellular mobile phone
    comprising five components: (i) a built in camera unit, (ii)
    a user interface, (iii) a display, (iv) a microprocessor
    adapted to control the operations of the camera unit, and
    (v) a means for transmitting image information over a
    radio frequency channel. ’078 patent, 16:1–13. Claim 73
    further recites that the camera unit comprises (i) optics
    for obtaining image information, (ii) an image sensor, and
    (iii) a means for processing and storing at least a portion
    of the image information obtained from the camera unit
    for later recall and processing. 
    Id.
     at 16:14–19. In short,
    the language of claim 73 makes clear that the “means for
    processing and storing” is part of the camera unit, not the
    overall device.
    The components of the claimed device are dia-
    grammed in Figure 3. 
    Id.
     at 2:27–28. Figure 3 indicates
    that the device includes both a “data processing unit” with
    a central “processor 4” and system-level “memory unit
    13.” 
    Id.
     at 2:41–42, 2:66–3:5. The “camera unit 14” is a
    separate and distinct component of the overall device that
    communicates with the “data processing unit” via “in-
    put/output controller 5.” 
    Id.
     at 3:13–14. The specification
    explains that the structure of the camera unit “conforms
    to the block diagram shown in Fig. 5” of the ’078 patent.
    
    Id.
     at 4:23–25. Figure 5 illustrates that the camera unit
    includes a “camera 14a and optics 15b, image processing
    unit 14c, [and] battery 21.” 
    Id.
     at 4:23–28. The camera
    unit’s image processing unit is a “microprocessor 23” and
    “a number of memory units 24.” 
    Id.
     at 4:29–31, 4:37–41.
    Thus, consistent with the express language of the claim,
    the specification indicates that the camera unit’s “micro-
    processor 23” and “memory units 24” are different than
    and separate from the device’s central “processor 4” and
    system level “memory unit 13.” 
    Id.
     at 2:41–42, 2:66–3:5.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   15
    A picture taken by the camera unit is “transferred to
    [its] image processing unit 14c and through its micropro-
    cessor 23 to [its] memory unit 24.” 
    Id.
     at 4:53–54. When
    a user wishes to view the picture, the image information
    is read from the camera unit’s “memory unit 24” by the
    camera unit’s “microprocessor 23,” and is then transmit-
    ted to the notebook computer’s “processor 4” for display.
    
    Id.
     at 4:54–62. The specification emphasizes that it is the
    camera unit’s “[i]mage processing unit 14c [which] pro-
    cesses the image information into a suitable form” to be
    displayed by the notebook computer. 
    Id.
     at 4:62–63.
    The specification thus clearly links two structures to
    the claimed means for performing the function of pro-
    cessing and storing image information obtained by the
    camera for later recall: “microprocessor 23” and “memory
    unit 24,” the processor and memory units within the
    camera unit. Nowhere in the specification is the claimed
    function of processing and storing an image captured by
    the camera unit performed by the device’s separate “pro-
    cessor 4” or system-level “memory unit 13.” See 
    id.
     at
    3:18–21, 4:57–62, and 5:17–21 (explaining that later
    recall of image information captured by the camera unit
    requires transfer of image information from the camera
    unit’s memory to the device’s separate central processor
    and system-level memory). In addition, the specification
    does not suggest that the camera unit’s processor and
    memory perform functions beyond the processing and
    storing of image information for later recall. Indeed, the
    specification indicates that software for controlling the
    notebook computer’s other functionality—telephone and
    facsimile services, e-mail, SMS, and calendar programs—
    resides in the system-level “memory unit 13,” not the
    camera unit’s “memory unit 24.” 
    Id.
     at 3:54–62.
    MobileMedia’s contention that the specification does
    not expressly limit the function of the camera unit’s
    microprocessor and memory to processing and storing
    image information for later recall does not justify the
    16                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    district court’s construction, which erroneously expands
    the scope of the “means for processing and storing” to
    include any image processing unit or memory unit. The
    scope of a means-plus-function limitation is outlined not
    by what the specification and prosecution history do not
    say, but rather by what they do say. As we noted in
    Medtronic, Inc. v. Advanced Cardiovascular Systems, Inc.,
    the fact that “a structure may perform two functions and
    that a function may be performed by two structures” is
    “irrelevant in the context of a § 112, paragraph 6 analysis
    without a clear link or association between the function or
    functions recited in the means-plus-function limitation
    and the structure or structures disclosed in the specifica-
    tion for carrying out those functions.” 
    248 F.3d 1303
    ,
    1313 (Fed. Cir. 2001) (emphasis added).          And Mo-
    bileMedia identifies no portion of the specification or
    prosecution history that clearly links any structure to the
    claimed function of processing and storing image infor-
    mation for later recall other than the camera unit’s “mi-
    croprocessor 23” and “memory units 24.”
    Accordingly, the structures corresponding to the
    claimed function of the “means for processing and storing”
    encompass only “microprocessor 23” and “memory unit
    24,” the camera unit’s processor and memory units.
    Correctly construed, no reasonable jury could conclude
    that Apple’s accused products literally infringe the
    “means for processing and storing” limitation of claim 73.4
    Literal infringement of a § 112 ¶ 6 limitation requires
    that the relevant structure in the accused device perform
    the identical function recited in the claim and be identical
    or equivalent to the corresponding structure in the speci-
    4  MobileMedia did not contend that Apple’s accused
    iPhones infringe the ’078 patent under the doctrine of
    equivalents before the district court, J.A. 8302, and does
    not do so here on appeal.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   17
    fication. Odetics, Inc. v. Storage Tech. Corp., 
    185 F.3d 1259
    , 1267 (Fed. Cir. 1999). Here, the parties do not
    dispute that the camera module in Apple’s accused
    iPhones has no internal memory for storing image data.
    J.A. 5970–71; J.A. 8914. Thus, the camera module of
    Apple’s iPhones has no structure corresponding to the
    function of storing at least a portion of processed image
    information. Although MobileMedia contends that the
    “main memory of the iPhone” is the camera unit’s means
    for storing, J.A. 19632, this “main memory” is not located
    within the iPhone camera module, which is what claim 73
    requires.
    Therefore, we reverse the district court’s judgment
    that Apple infringes claim 73 of the ’078 patent. We need
    not reach Apple’s alternative noninfringement argument
    that the district court erred in its construction of the
    “means . . . for transmitting” limitation in claim 73.
    B. The ’068 patent (call handling)
    The ’068 patent is directed to the display of call han-
    dling options in a menu on a mobile phone’s display
    screen. ’068 patent, Abstract. Examples of call handling
    options include “hold” and “disconnect.” 
    Id.
     at 6:14–30.
    According to the ’068 patent, at the time of the claimed
    invention, users were required to memorize specific
    sequences of keys in order to execute call handling options
    on a mobile phone. 
    Id.
     at 1:29–39. The ’068 patent’s
    method for displaying a menu of options on the phone’s
    display screen allows users to select an option from a
    menu instead of needing to remember different key se-
    quences. See 
    id.
     at Figs. 6, 8–11, and 1:62–67. The
    specification explains that the mobile phone either dis-
    plays this menu automatically when it receives an incom-
    ing call, or waits to display the menu until the user
    performs an action, such as when the user presses a key.
    
    Id.
     at Fig. 6 and 7:33–37, Figs. 8–9 and 12:42–44 (auto-
    18                        MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    matic); 
    id.
     at Fig. 10 and 12:45–52, Fig. 11 and 14:19–38
    (user action). Claim 23 of the ’068 patent recites:
    23. A communicating method for controlling a
    connecting state of a call into a desired connecting
    state upon a predetermined operation by a user,
    comprising the steps of:
    displaying processing items [i.e., call handling op-
    tions] available to the user relative to the call on a
    display;
    selecting and determining a desired processing
    item out of said processing items displayed on said
    display by the user operating an input unit; and
    controlling the processing items being displayed
    on said display and controlling the call into a con-
    necting state corresponding to the processing item
    selected and determined by the operation of said
    input unit by the user,
    wherein said step of controlling the processing
    items includes displaying said processing items
    [i.e., call handling options] on said display when
    only a single predetermined selection operation is
    made by the user,
    wherein said step of controlling the processing
    items includes listing said processing items avail-
    able to the call on said display for each call.
    ’068 patent (reexamination certificate), 4:17–37 (emphasis
    added).
    In more plain language, claim 23 recites a method re-
    quiring (i) a mobile phone to display call handling options
    on a menu screen, (ii) the user to select one of these
    options, and (iii) the mobile phone to execute the call
    handling option selected by the user. Claim 24 of the ’068
    patent is identical to claim 23 for most of its limitations,
    except that it requires the “processing items” to be dis-
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   19
    played in response to “a predetermined selection opera-
    tion” instead of “only a single predetermined selection
    operation.” 
    Id.
     at 4:37–61 (emphasis added).
    We turn first to Apple’s JMOL motion of invalidity.
    Although the district court granted Apple’s motion in
    part, finding that no reasonable jury could conclude that
    claim 24 of the ’068 patent was not invalid as anticipated
    by 
    U.S. Patent No. 5,754,636
     (Bayless), the district court
    denied Apple’s motion as to claim 23, rejecting Apple’s
    argument that claim 23 is anticipated by or rendered
    obvious over the same reference. MobileMedia JMOL,
    966 F. Supp. 2d at 461–65. Apple contends that the
    district court erred as to claim 23.
    Bayless discloses a telecommunications system that
    allows users to make and receive phone calls from a
    computer. Bayless, 1:58–62. Bayless’ system has a
    graphical user interface that can display call handling
    options available to the user in a “Make & Answer Calls”
    window. Id. at Fig. 41. The user prompts the Bayless
    system to display this call handling options window by
    activating what Bayless describes as a “Hotkey.” Id. at
    Fig. 42. Figure 42 provides one exemplary configuration
    for this “Hotkey,” showing that the Bayless “Make &
    Answer Calls” window is displayed when a user presses
    the keyboard’s “Ctrl” and “0” keys. Id.
    The district court determined that because Bayless’
    call handling options window is displayed only after a
    user presses two keys in a serial sequence, the jury could
    reasonably find that Bayless’ “Hotkey” constituted “mul-
    tiple ‘predetermined selection operations’ [] rather than
    one [such operation].” MobileMedia JMOL, 966 F. Supp.
    2d at 463–64. Thus, because claim 23 requires call han-
    dling options to be displayed in response to “only a single
    predetermined selection operation”—unlike claim 24,
    which allowed these options to be displayed after any
    number of “predetermined selection operation[s]”—the
    20                       MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    district court denied Apple’s motion for JMOL as to claim
    23, while granting it as to claim 24. Id.; compare ’068
    patent (reexamination certificate), 4:31–34 (emphasis
    added), with id. at 4:51–54.
    Apple contends that the unrebutted testimony at trial
    demonstrated that using one key instead of two keys to
    activate a window was well within the common knowledge
    of those with skill in the art. See J.A. 20044–45. For
    example, Apple’s expert explained that in the industry, an
    “operation” would have been understood to include “one or
    more physical keys that result in a single action,” such as
    to bring up and display Bayless’ “Make & Answer Calls”
    window. J.A. 20026, 20043. Apple’s expert further ex-
    plained that a skilled artisan “would know that [the
    “Hotkey” operation of Bayless] does not have to be two
    keys,” and that the “Hotkey” could easily be programmed
    as a single key. J.A. 20022–23, 20045. In addition,
    Apple’s expert testified that the inclusion of “pull-down”
    selection boxes on the “Hotkey” menu would have explicit-
    ly signaled to one of skill in the art that the “Ctrl” and “0”
    key sequence could be changed to a different key se-
    quence, such as to the single “F1” function key. J.A.
    20044. Apple’s expert concluded that it would have been
    obvious to one of skill in the art to implement the Bayless
    “Hotkey” operation with a single key. J.A. 20045. Mo-
    bileMedia’s expert did not rebut this testimony, offering
    only the conclusory statement that “I don’t see evidence
    for that.” J.A. 20506. Conclusory statements by an
    expert, however, are insufficient to sustain a jury’s ver-
    dict. See Krippelz v. Ford Motor Co., 
    667 F.3d 1261
    ,
    1268–69 (Fed. Cir. 2012).
    While Apple’s expert provided specific reasons why a
    skilled artisan would have found claim 23 to be obvious in
    view of Bayless and common knowledge possessed by
    those of skill in the art, MobileMedia’s expert provided
    only testimony unrelated to the actual limitations of claim
    23. For example, MobileMedia’s expert asserted that it
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                    21
    would not have been obvious to a skilled artisan to use a
    single key as Bayless’ “Hotkey” because the designer of
    the Bayless user interface for a computer faced different
    challenges than the designer of the mobile phone interface
    of the ’068 patent. J.A. 20491–92. MobileMedia’s expert
    sought to justify his assertion by explaining that Bayless
    “is talking about keyboards and PCs, whereas [claim 23 of
    the ’068 patent] has a different set of engineering
    tradeoffs,” relating to “cellphones” and “ease of use.” 
    Id.
    In a similar vein, MobileMedia’s expert also testified that
    the 16 months between Bayless’ and the ’068 patent’s
    filing date suggests that claim 23 was inventive because
    Apple “could not point to [] a single person that ever did
    use a single button on a cellphone” during this timeframe.
    J.A. 20653 (emphasis added). Claim 23, however, recites
    only a “communicating method for controlling a connect-
    ing state of a call,” and includes no limitation that con-
    fines the claimed method to a cell phone or computer.
    ’068 patent (reexamination certificate), 4:17–37. And
    during cross-examination, MobileMedia’s expert conceded
    that “the fact that Bayless was implemented on a PC
    instead of on a cellphone [wa]sn’t relevant” to the “com-
    municating method” recited in the preamble of the claim.
    J.A. 20494.
    In short, there is no substantial evidence to support a
    conclusion that a skilled artisan would not have found it
    obvious to take the straightforward and commonsensical
    step to configure the Bayless “Hotkey” to display the
    “Make & Answer Calls” window after the press of one key
    instead of two keys. No reasonable jury could conclude
    that claim 23 of the ’068 patent would not have been
    obvious in view of Bayless and the common knowledge of
    a person with ordinary skill in the art. Thus, the district
    court erred by denying Apple’s motion for JMOL of inva-
    lidity and we therefore reverse the district court’s judg-
    ment that claim 23 of the ’068 patent is not invalid. We
    need not reach Apple’s argument that its accused iPhones
    22                       MOBILEMEDIA IDEAS LLC     v. APPLE INC.
    do not infringe the “listing said processing items” limita-
    tion of claim 23.
    IV. MOBILEMEDIA’S CROSS-APPEAL
    A. The ’075 patent (call rejection)
    The ’075 patent describes a method for allowing a us-
    er to reject an incoming call when the user is already
    active on another call. In particular, the ’075 patent
    describes a cell phone that allows a user, by pressing a
    key, to reject the incoming call. ’075 patent, 3:24–47.
    According to the ’075 patent, pressing this key sends a
    “rejection message” to the applicable cell tower, indicating
    that the mobile telecommunications network should
    immediately release (i.e., drop) the second incoming call
    because the receiving phone is “unavailab[le].” 
    Id.
     at
    3:63–4:21.
    MobileMedia asserts that Apple’s accused iPhones in-
    fringe apparatus claim 10, as well as method claims 5 and
    6. For the purposes of this appeal, claim 10 of the ’075
    patent is representative:
    10. In a mobile communications device, apparatus
    in communication with a first calling station for
    selectably rejecting an incoming call, said appa-
    ratus comprising:
    a transceiver operable to send and receive trans-
    missions to and from a remote transceiver in a
    wireless system on a communications channel,
    said transceiver for receiving a transmission sig-
    nifying that an incoming call is being attempted;
    and
    a control processor coupled to said transceiver,
    said control processor for determining if said in-
    coming call is to be rejected, and, in response to a
    positive determination, said control processor for
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     23
    outputting a rejection message to said transceiver
    for transmission to said remote transceiver,
    wherein said rejection message comprises at least
    one information element indicating to the wireless
    system that the wireless system is to immediately
    release the incoming call on the communication
    channel between the mobile communications
    device and remote transceiver.
    ’075 patent (reexamination certificate), 1:26–45 (emphasis
    added). The parties agree that the asserted claims re-
    quire a mobile phone, which is already active on a call (“in
    communication with a first calling station”), to receive an
    incoming second call, and send a “rejection message” to a
    cell tower (“remote transceiver”) in the mobile network.
    The “rejection message” notifies the wireless system to
    immediately release the incoming call. 
    Id.
     at 1:40–42.
    The district court construed the term “immediately re-
    lease” to require that “the wireless system must, without
    requiring any additional action by or communication from
    the mobile phone, ‘release the incoming call on the com-
    munication channel between the mobile phone and re-
    mote transceiver.’” MobileMedia SJ, 907 F. Supp. 2d at
    591. Thus, the district court determined that the term
    “immediately” did not refer to a time period, but to an
    action, and specifically, to the absence of an action. Nei-
    ther party disputes the district court’s construction on
    appeal.
    Both parties agree that Apple’s accused iPhones allow
    users to reject an incoming call while active on a first call
    by tapping an “ignore” icon on the iPhone’s screen, or
    alternatively, by pressing the power key twice. Id. at 592.
    The parties focused their arguments for infringement and
    invalidity on the contents of a comprehensive set of inter-
    related technical protocols developed by the European
    Telecommunications Standards Institute that together
    implement the Global System for Mobile communications
    24                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    (GSM) standard for cellular networks. See, e.g., J.A.
    57185. Apple’s accused iPhones, which operate on GSM
    networks, were designed to comply with this GSM stand-
    ard. Appellant’s Reply Br. 41. Relevant here, GSM
    24.008 provides “core network protocols” that describe
    how mobile phones communicate with cell towers in a
    GSM network in order to make and receive calls and send
    and receive data. See generally J.A. 56260–56785. GSM
    24.083 provides more specific protocols for implementing
    call waiting and call holding functions. See J.A. 56242–
    59. These two protocols of the GSM standard supply the
    technical information necessary to implement the particu-
    lar call waiting function at issue in MobileMedia’s cross-
    appeal.
    Before the district court, Apple filed a motion for
    summary judgment of noninfringement on the ground
    that its accused iPhones do not practice the “rejection
    message” limitation of the asserted claims. In its motion,
    Apple did not contest that its accused iPhones imple-
    mented the relevant sections of the GSM 24.083 and GSM
    24.008 protocols, but argued that these sections were
    outside the scope of the asserted claims of the ’075 patent.
    In particular, Apple argued that a user’s rejection of an
    incoming call did not “immediately release” the call
    because additional action by and communication from the
    accused iPhone was required in order to actually termi-
    nate and release the call. Id. Apple explained that ac-
    cording to the GSM 24.083 and GSM 24.008 protocols,
    when a user elects to “ignore” an incoming call, the mobile
    phone transmits a “DISCONNECT” message to the mo-
    bile network. J.A. 56250 (GSM 24.083, § 1.3.1). After
    receipt of this “DISCONNECT” message, the mobile
    network enters into a “release request” state for the call,
    and waits for further response from the mobile phone.
    J.A. 56455 (GSM 24.008, § 5.4.3.2); J.A. 56429 (GSM
    24.008 § 5.1.2.2.13). The mobile phone then responds
    with a “RELEASE COMPLETE” message, and it is only
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   25
    after the mobile network receives this message that it
    releases the incoming call. J.A. 56455 (GSM 24.008
    §§ 5.4.3.3, 5.4.3.4).
    MobileMedia responded that the entire exchange of
    messages should be considered to be “rejection messages.”
    MobileMedia SJ, 907 F. Supp. 2d at 592. MobileMedia
    also pointed to an “abnormal case” in the GSM 24.008
    protocol, in which the “ignored” call is released after
    receipt of the “DISCONNECT” message without the usual
    exchange of further messages between the mobile phone
    and mobile network described above. Id. at 592. Mo-
    bileMedia contended that in this “abnormal case,” the
    mobile network can release the call if no further commu-
    nication from the mobile phone is received for the dura-
    tion of two successive timer periods. Id.; see also J.A.
    56455–56 (GSM 24.008, § 5.4.3.5).
    The district court granted Apple’s motion for sum-
    mary judgment of noninfringement in part. MobileMedia
    SJ, 907 F. Supp. 2d at 593. It found that in the normal
    case, there was no genuine dispute that Apple’s iPhones
    did not meet the “immediately release” limitation of the
    asserted claims. Id. The district court determined,
    however, that there was still a question of fact as to
    whether the accused iPhones infringed under the GSM
    24.008 protocol’s “abnormal case.” Id.
    Apple also filed a motion for summary judgment of in-
    validity based on obviousness, relying on disclosures in
    two different sections of prior versions of the same proto-
    cols in the GSM standard that MobileMedia relied on for
    evidence of infringement. Id. Specifically, GSM 04.08
    and GSM 04.83—earlier versions of GSM 24.008 and
    GSM 24.083, respectively—were published more than
    three years before the earliest priority date of the ’075
    26                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    patent. Id. 5 Further, MobileMedia agreed, and does not
    dispute here, that the prior art GSM 04.83 and GSM
    04.08 protocols are identical in all relevant aspects to
    their later-version counterparts (GSM 24.083 and GSM
    24.008). Id. at 594.
    Whereas MobileMedia relied on Apple’s alleged im-
    plementation of GSM 24.008, § 5.4 (entitled “Call clear-
    ing”) for its infringement theory, Apple based its
    invalidity challenge on GSM 04.08, § 5.2.2 (entitled “Mo-
    bile terminating call establishment”). Id. Apple asserted
    that this section discloses a “RELEASE COMPLETE”
    message transmitted from a mobile phone to the mobile
    network that, unlike the “DISCONNECT” message relied
    on by MobileMedia to allege infringement, can release an
    incoming call without any further communication be-
    tween the mobile phone and the network. Id. Apple
    contended that this message, in combination with GSM
    04.83, §§ 1.1 and 1.3.1, which provide instructions for
    implementing call waiting functionality—including the
    treatment of incoming calls when a user is already active
    on a call, J.A. 57583—discloses every limitation of the
    ’075 patent’s asserted claims. MobileMedia SJ, 907 F.
    Supp. 2d at 595.
    The district court agreed that MobileMedia had not
    raised any genuine dispute that GSM 04.83 and GSM
    04.08 disclose all limitations of the ’075 patent’s asserted
    5  Before the district court (and here on appeal), Ap-
    ple also contended that (i) the GSM 04.08 and GSM 04.83
    standards should be treated as a single document, and
    thus anticipate the asserted claims, and (ii) the asserted
    claims of the ’075 patent were rendered obvious by the
    GSM 04.08 and GSM 04.83 standards in combination
    with the ’068 patent. MobileMedia SJ, 907 F. Supp. 2d at
    595; Cross-Appellee’s Br. 67–69. We need not reach
    either of these issues to resolve this appeal.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   27
    claims. Id. at 594. The district court, however, denied
    Apple’s summary judgment motion of invalidity because it
    found that a genuine dispute of material fact existed as to
    whether a person having ordinary skill in the art would
    have been motivated to combine the two protocols in the
    GSM standard to arrive at the asserted claims. Id. at
    595–96. At trial, the jury found that Apple’s accused
    iPhones infringed the asserted claims of the ’075 patent
    under the “abnormal” case described in GSM 24.008,
    § 5.4.3.5. MobileMedia JMOL, 966 F. Supp. 2d at 457.
    The jury also found that the asserted claims of the ’075
    patent were not invalid. Id. at 455. The district court,
    however, granted Apple’s renewed motion for JMOL as to
    noninfringement and invalidity for obviousness. Id. at
    457, 459. In its cross-appeal, MobileMedia contends that
    the district court erred in granting Apple’s JMOL motions
    because substantial evidence supports the jury’s verdict of
    both infringement and nonobviousness.
    We turn first to the district court’s grant of Apple’s
    JMOL motion of invalidity, which we review de novo.
    Bos. Scientific, 
    554 F.3d at 990
    . In evaluating that JMOL
    motion, the district court first noted that MobileMedia did
    not dispute that the GSM 04.08 and GSM 04.83 protocols
    disclose every limitation of the asserted claims. Mo-
    bileMedia JMOL, 966 F. Supp. 2d at 454. Nor did Mo-
    bileMedia offer any evidence of objective indicia of
    nonobviousness. Id. Thus, as on summary judgment, the
    parties’ dispute centered on whether one with ordinary
    skill in the art would have been motivated to combine the
    two GSM standards at the time of the alleged invention.
    The district court found that Apple’s expert provided
    several reasons that a skilled artisan would have com-
    bined the two relevant protocols of the GSM standard. Id.
    at 453. Apple’s expert explained that the GSM 04.08
    (fundamental interactions between mobile phones and the
    mobile network) and 04.83 (specific call waiting and call
    holding functions) protocols were both part of the same
    28                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    comprehensive GSM standard published by the European
    Telecommunications Standards Institute in 1995. Id. An
    Apple engineer testified that engineers routinely refer-
    ence different “portions of the GSM standard[]” and that if
    an engineer needed to implement a particular mobile
    phone function according to the GSM standard, it was
    “trivial” to find the relevant sections in the GSM protocols
    because each protocol includes a detailed table of contents
    and index. Id.; J.A. 19941. Apple’s expert also explained
    that GSM 04.83 expressly references GSM 04.08 in nu-
    merous places, instructing that mobile phones “shall act
    in accordance with GSM 04.08” to implement the specific
    call waiting and call clearing functions relevant here, and
    that the referenced sections of the GSM 04.08 and GSM
    04.83 protocols are labeled in a “similar” manner. Mo-
    bileMedia JMOL, 966 F. Supp. 2d at 453; J.A. 20185–86.
    Specifically, GSM 04.83, § 1.1 is titled “Waiting call
    indication and confirmation” in the index, and the com-
    panion sections in GSM 04.08 are titled “Call indication”
    (§ 5.2.2.1) and “Call confirmation” (§ 5.2.2.3). Compare
    J.A. 57577 (table of contents for GSM 04.83), with J.A.
    57175 (same for GSM 04.08).
    In contrast, MobileMedia’s expert testified that a per-
    son having ordinary skill in the art would have been
    discouraged from using GSM 04.08 to implement the
    rejection of an incoming call in a call waiting context
    because GSM 04.08 only describes how to handle a single
    call, not multiple calls. MobileMedia JMOL, 966 F. Supp.
    2d at 454; J.A. 20482. The district court found, however,
    that this testimony could only support a jury verdict that
    the GSM 04.08 protocol in isolation did not render the
    asserted claims anticipated or obvious. MobileMedia
    JMOL, 966 F. Supp. 2d at 455. As to whether a skilled
    artisan, in view of both the GSM 04.08 and GSM 04.83
    protocols in the GSM standard, would have been motivat-
    ed to combine them, the district court noted that Mo-
    bileMedia’s expert offered only conclusory testimony that
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     29
    “[GSM 04.83] is small, [GSM 04.08] is big.” Id.; J.A.
    20482. But as the district court found, the fact that one
    protocol is “big” and one protocol is “small” in terms of its
    number of pages provides no counter to the testimony of
    Apple’s expert that it would have been obvious to a person
    of ordinary skill in the art to consult both GSM protocols
    to implement the claimed call waiting functionality by
    following the express references to GSM 04.08 within
    GSM 04.83 and using the detailed table of contents in
    GSM 04.08 to locate the relevant “Call indication” and
    “Call confirmation” sections within that document. Mo-
    bileMedia JMOL, 966 F. Supp. 2d at 455.
    MobileMedia also argues that the rejection message
    disclosed in the GSM 04.08 protocol—which includes
    several fields providing information about the mobile
    phone sending the message to the mobile network—has
    one informational field suggesting that the mobile phone
    is not busy, and thus the skilled artisan would have been
    discouraged from combining GSM 04.08 with GSM 04.83,
    which addresses scenarios where the mobile phone is
    busy. Specifically, MobileMedia points to where GSM
    04.08 indicates that the RELEASE COMPLETE message
    includes an informational field stating “cause #21 ‘call
    rejected.’” J.A. 57262 (GSM 04.08, § 5.2.2.3.1). Mo-
    bileMedia’s expert testified that one of skill in the art, to
    understand the meaning of that text field, would have
    used the table of contents to locate the “Annex H” section
    of GSM 04.08 (which includes “GSM specific cause values
    for call control”), and find that “cause #21” indicates that
    “the equipment sending this cause does not wish to accept
    this call although it could have accepted the call because
    the equipment sending the cause is neither busy nor in-
    compatible.” J.A. 20474–76; J.A. 57559–60 (GSM 04.08,
    30                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    Annex H and Annex H.1.9) (emphasis added). 6 Mo-
    bileMedia’s expert testified that “this message means I’m
    [not] busy” and that “to a person of ordinary skill, this
    message is sent only if [the mobile phone] is not busy.”
    J.A. 20476–77.
    The district court, however, correctly found that this
    testimony again failed to consider that the skilled artisan
    would be aware of both the GSM 04.08 and GSM 04.83
    protocols. MobileMedia JMOL, 966 F. Supp. 2d at 456.
    The trial record shows that MobileMedia sought testimo-
    ny from its expert only on “the ability of [GSM] 04.08 to
    be used to reject [a] second call.” J.A. 20474 (emphasis
    added). Thus, MobileMedia’s expert testified merely that
    a skilled artisan looking at this “cause value” would have
    “been discouraged from using this document [GSM 04.08]”
    and would have been “discouraged [after] looking at the
    document [GSM 04.08] and finding no help” for imple-
    menting the claimed invention. Id (emphases added). As
    the district court found, “MobileMedia’s validity theories
    did not address the fact that one of ordinary skill also
    knew the contents of GSM 04.83 and could start there.”
    MobileMedia JMOL, 966 F. Supp. 2d at 456 (emphasis
    added).
    And Apple demonstrated that after starting with
    GSM 04.83, a skilled artisan would have been led to GSM
    04.08. In particular, GSM 04.83, § 1.1 (entitled “Waiting
    call indication and confirmation”) expressly instructs that
    a mobile phone and the mobile network should interact in
    6   MobileMedia’s expert did not explain why one of
    skill in the art would allegedly rely on the indices provid-
    ed in GSM 04.08 to locate more detailed definitions of
    certain terms, while at the same time ignoring the indices
    for the purpose of locating the similarly-titled call waiting
    protocol sections in GSM 04.08 expressly referenced by
    GSM 04.83.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                   31
    accordance with GSM 04.08 if a user receives an incoming
    call when the user is already active on a call. J.A. 57583.
    To release the incoming call, the mobile phone, inter alia,
    sends a “[call] clearing message” to the mobile network
    indicating that the user is busy. J.A. 57585 (GSM 04.83,
    § 1.3.1). GSM 04.08 discloses several types of “call clear-
    ing” messages and procedures for handling those messag-
    es. See J.A. 57174–75. One type of “call clearing”
    message is the “DISCONNECT” message that Mo-
    bileMedia relied on as evidence of infringement, which is
    described in §§ 5.4.2, 5.4.3.1, and 5.4.3.2, among others.
    Section 5.2.2.3.1 describes another type of “call clearing”
    message—a “RELEASE COMPLETE” message—that in
    some circumstances can be sent by the mobile phone
    instead of the “DISCONNECT” message, and is “pro-
    cessed” by the mobile network “in accordance with section
    5.4.” J.A. 57262. 7 Relevant here, upon receipt of a
    “RELEASE COMPLETE” message, the mobile network
    releases the incoming call without waiting for additional
    communication from the mobile phone. J.A. 57273 (GSM
    04.08, § 5.4.3.4). Thus, as Apple notes, it is the message
    (i.e., RELEASE COMPLETE), and not the text field
    within that message (e.g., “cause #21”), that prompts the
    mobile network to release the call. Indeed, the GSM
    standard requires that the mobile network “shall accept
    an incoming RELEASE COMPLETE message used to
    initiate the [call] clearing even though the cause infor-
    mation is not included.” J.A. 57272 (GSM 04.08, § 5.4.2)
    (emphasis added).
    On the basis of these findings, the district court con-
    cluded that even when resolving all disputed facts in
    MobileMedia’s favor, no reasonable jury could conclude
    that the asserted claims of the ’075 patent are not invalid
    7  According to Apple, its accused iPhones do not
    implement this particular GSM protocol. J.A. 20185.
    32                      MOBILEMEDIA IDEAS LLC    v. APPLE INC.
    as obvious over the GSM 04.08 and GSM 04.83 protocols
    in the GSM standard. MobileMedia JMOL, 966 F. Supp.
    2d at 457. After careful examination of the record, we
    agree with the district court’s finding that no substantial
    evidence supports a determination that one of ordinary
    skill in the art would not have been motivated to combine
    §§ 1.1 and 1.3 of GSM 04.83 and § 5.2.2 of GSM 04.08.
    Similarly, we find no error in the district court’s ultimate
    conclusion that no reasonable jury could conclude that
    claims 5, 6, and 10 of the ’075 patent are not invalid as
    obvious in view of those two protocols in the GSM stand-
    ard.
    We therefore affirm the district court’s grant of Ap-
    ple’s motion for JMOL of invalidity of the asserted claims
    of the ’075 patent. We need not reach MobileMedia’s
    appeal from the district court’s grant of Apple’s motion for
    JMOL of noninfringement of those same claims.
    B. The ’231 patent (call alerts)
    The ’231 patent discloses a communication device,
    such as a mobile phone, that permits a user to stop a
    ringtone alert for an incoming call without notifying the
    caller. ’231 patent, Abstract. According to the ’231 pa-
    tent, when a user received an unwanted call, the prior art
    provided several options for silencing the ringtone trig-
    gered by receipt of that call: (i) answering but then quick-
    ly “hang[ing] up,” thus “forcibly disconnecting” the call, or
    (ii) turning off the phone. Id. at 1:17–25. Forcibly dis-
    connecting the call, however, left the caller with “an
    unpleasant feeling” because the caller “c[ould] notice that
    the circuit was broken off intentionally.” Id. at 1:26–29.
    Turning off the phone was not preferable because the user
    could forget to turn the phone on again, “possib[ly] miss-
    ing the next incoming call.” Id. at 1:37–42. The ’231
    patent provides several alternatives to silence a ringtone
    without these drawbacks. Id. at 4:66–5:17.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                      33
    In one embodiment, a user can press the phone’s pow-
    er key for some amount of time in order to stop the ring-
    tone sound without ending the call. Id. at 2:57–3:6; see
    also id. at Fig. 3 (“stop alert sound”). In another embodi-
    ment, pressing the phone’s power key reduces the volume
    of the ringtone sound. Id. at 4:40–47; see also id. at Fig. 4
    (“reduce volume of alert sound”). Asserted claim 12 is
    excerpted below:
    12. A communication terminal for informing a us-
    er of a received call from a remote caller by an
    alert sound, comprising:
    an alert sound generator for generating the alert
    sound when the call is received from the remote
    caller;
    control means for controlling said alert sound
    generator;
    ...;
    wherein said alert sound generator is generating
    the alert sound and . . . , said control means con-
    trols said alert sound generator to change a vol-
    ume of the generated alert sound only for the
    received call, without affecting the volume of the
    alert sound for future received calls, while leaving
    a call ringing state, as perceived by the remote
    caller, of the call to the terminal from the remote
    called unchanged . . . .
    ’231 patent (reexamination certificate), 2:11–39 (emphasis
    added). Asserted claim 2, which depends from claim 12,
    recites:
    2. The communication terminal according to claim
    12, wherein said control means controls the state
    of said alert sound generator to stop the sound.
    Id. at 1:31–34 (emphasis added). Asserted claim 3, which
    also depends from claim 12, recites:
    34                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    3. The communication terminal according to
    claim 12, wherein said control means controls the
    state of said alert sound generator to reduce the
    volume of the sound.
    Id. at 1:35–39 (emphasis added).
    Relevant to MobileMedia’s cross-appeal, the district
    court construed the term “to change a volume of the
    generated alert sound” in claim 12 as “to alter the degree
    of loudness of the alert sound that is being generated
    without cutting off the telephone circuit.” MobileMedia
    SJ, 907 F. Supp. 2d at 598. Further, the district court
    interpreted the “stop[ping] the sound” limitation in de-
    pendent claim 2 as not encompassed by the “chang[ing] a
    volume” limitation in independent claim 12. Id. Thus,
    rather than narrowing the scope of claim 12’s “change a
    volume” limitation, the district court appears to have
    interpreted dependent claim 2’s “stop the sound” limita-
    tion as providing an additional, separate function to the
    claimed communication terminal recited in independent
    claim 12. In support of its construction, the district court
    reasoned that “chang[ing] a volume” and “stop[ping] the
    sound” were described in the specification as “alterna-
    tives, not interchangeable terms.” Id.
    Under this construction, the district court determined
    Apple did not infringe any asserted claim of the ’231
    patent. Id. at 599. In particular, while Apple’s accused
    iPhones include a control means that can stop the sound
    of a ringtone, the district court found that Apple’s iPhones
    do not “reduce, increase, mute, or otherwise change the
    volume of the audio [alert sound] playback [as required by
    claim 12].” Id. at 598. MobileMedia contends that the
    district court erred by construing this limitation of the
    independent claim to exclude both the narrower “stop the
    sound” and “reduce the volume of the sound” embodi-
    ments disclosed in the ’231 patent’s specification and
    recited in asserted dependent claims 2 and 3, respectively.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                     35
    Because the district court’s construction relies only on
    intrinsic evidence, we review its construction de novo.
    Teva, 135 S. Ct. at 841. Neither party disputes that the
    “control means” invokes 
    35 U.S.C. § 112
     ¶ 6. Thus, this
    means-plus-function limitation covers the corresponding
    structure described in the specification for performing the
    claimed function, and equivalents thereof. Saffran v.
    Johnson & Johnson, 
    712 F.3d 549
    , 561 (Fed. Cir. 2013).
    The language of the claims indicates that the function
    performed by the “control means” is “controlling the alert
    sound generator to change a volume of the generated alert
    sound.” See ’231 patent (reexamination certificate), 2:26–
    27. The only structure disclosed in the specification for
    performing this claimed function is the phone’s CPU and
    alert sound generator on/off controller. 
    Id.
     at 2:49–52. In
    response to depression of the phone’s power key, the
    specification indicates that the CPU and on/off controller
    can “stop the generation of the alert sound.” 
    Id.
     at 3:3–6;
    see also 
    id.
     at 2:53–55. As an alternative, the specifica-
    tion indicates that depression of the power key can in-
    stead result in the “volume of an alert sound [being]
    reduced.” 
    Id.
     at 4:37–43, 5:7–11. Compare 
    id.
     at Fig. 3
    (stopping a sound), with 
    id.
     at Fig. 4 (reducing a volume).
    In short, the specification indicates that the “control
    means” controls the alert sound generator to change a
    volume of the generated alert sound by either stopping
    the alert sound or reducing a volume of the alert sound.
    In the context of the specification, “chang[ing] a volume”
    encompasses both “stop[ping] the sound” and “reduc[ing]
    the volume of the sound.” See 
    id.
     Further, neither party
    has identified anything in the prosecution history or
    extrinsic evidence that would suggest otherwise.
    Apple contends that dependent claim 2 does not ex-
    plicitly tie the “stop the sound” limitation to the “change a
    volume” limitation in claim 12. In essence, Apple defends
    the district court’s construction on the ground that it is
    possible to construe claim 12 and claim 2 in a manner
    36                      MOBILEMEDIA IDEAS LLC   v. APPLE INC.
    such that “stop[ping] the sound” and “chang[ing] a vol-
    ume” are mutually exclusive. Apple speculates that a
    device could practice both by “dialing down the audio level
    to alter the degree of loudness . . . and then stopping the
    generation of the sound.” Cross-Appellee’s Br. 75. Apple,
    however, provides no support in the specification or
    prosecution history for its example. Regardless, Apple’s
    construction ignores that claim 2 ties “stop[ping] the
    sound” to the control means—the CPU and alert sound
    on/off controller. And as discussed supra, the specifica-
    tion describes this control means structure as stopping or
    reducing the volume of the alert sound.
    Finally, Apple contends that MobileMedia seeks to
    improperly use the doctrine of claim differentiation in
    order to broaden the scope of independent claim 12 be-
    yond what is supported by the specification. While we
    agree with Apple that “[t]he dependent claim tail cannot
    wag the independent claim dog,” N. Am. Vaccine, Inc. v.
    Am. Cyanamid Co., 
    7 F.3d 1571
    , 1577 (Fed. Cir. 1993), no
    such concern is present here. Rather, it is Apple that
    urges us to affirm a claim construction that would exclude
    a preferred embodiment of the invention disclosed in the
    specification. Such a construction is rarely correct with-
    out any persuasive evidentiary support. Adams Respira-
    tory Therapeutics, Inc. v. Perrigo Co., 
    616 F.3d 1283
    , 1290
    (Fed. Cir. 2010) (citing Vitronics Corp. v. Conceptronic,
    Inc., 
    90 F.3d 1576
    , 1583–84 (Fed. Cir. 1996)).
    Consistent with the specification, “controlling the
    alert sound generator to change a volume of the generated
    alert sound” by the “control means” encompasses both
    stopping and reducing the volume of the alert sound as
    recited in dependent claims 2 and 3, respectively. Be-
    cause the district court’s grant of Apple’s motion for
    summary judgment of noninfringement of claims 2–4 and
    12 of the ’231 patent was based on an erroneous construc-
    tion, we vacate the district court’s grant of this motion
    and remand to the district court for further proceedings.
    MOBILEMEDIA IDEAS LLC   v. APPLE INC.                       37
    ***
    We have considered the parties’ remaining arguments
    and find them unpersuasive.
    V. CONCLUSION
    For the foregoing reasons, we conclude that (i) sub-
    stantial evidence supports the jury’s determination that
    claim 73 of the ’078 patent is not invalid, (ii) no reasona-
    ble jury could find that claim 73 of the ’078 patent is
    infringed by Apple’s accused iPhones, (iii) no reasonable
    jury could conclude that claim 23 of the ’068 patent is not
    invalid as obvious under 
    35 U.S.C. § 103
    , (iv) no reasona-
    ble jury could conclude that claims 5, 6, and 10 of the ’075
    patent are not invalid as obvious in view of the GSM
    04.08 and GSM 04.83 protocols, and (v) that the district
    court’s claim construction of “to change a volume of the
    generate alert sound” was erroneous. Therefore, we (i)
    affirm the district court’s denial of Apple’s motion for
    JMOL of invalidity of claim 73 of the ’078 patent, (ii)
    reverse the district court’s denial of Apple’s motion for
    JMOL of noninfringement of claim 73 of the ’078 patent,
    (iii) reverse the district court’s denial of Apple’s motion for
    JMOL of invalidity of claim 23 of the ’068 patent, (iv)
    affirm the district court’s grant of Apple’s motion for
    JMOL of invalidity of claims 5, 6, and 10 of the ’075
    patent, (v) vacate the district court’s grant of summary
    judgment of noninfringement of claims 2–4 and 12 of the
    ’231 patent, and (vi) remand for further proceedings. In
    view of these holdings, we need not resolve any of the
    parties’ remaining appeals or cross-appeals.
    AFFIRMED IN PART, REVERSED IN PART,
    VACATED, AND REMANDED
    COSTS
    No costs.