Fitness Quest, Inc. v. Monti , 330 F. App'x 904 ( 2009 )


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  •                       NOTE: This disposition is nonprecedential.
    United States Court of Appeals for the Federal Circuit
    2008-1433
    FITNESS QUEST, INC.,
    Plaintiff-Appellee,
    v.
    JONATHAN MONTI,
    Defendant-Appellant.
    Steven M. Auvil, Benesch Friedlander Coplan & Aronoff, LLP, of Cleveland,
    Ohio, argued for plaintiff-appellee. With him on the brief was Bryan A. Schwartz.
    Arland T. Stein, Hahn Loeser & Parks LLP, of Columbus, Ohio, argued for
    defendant-appellant. With him on the brief were Steven J. Mintz and Robert J. Diaz, of
    Cleveland, Ohio.
    Appealed from: United States District Court for the Northern District of Ohio
    Judge Sara Lioi
    NOTE: This disposition is nonprecedential.
    United States Court of Appeals for the Federal Circuit
    2008-1433
    FITNESS QUEST, INC.,
    Plaintiff-Appellee,
    v.
    JONATHAN MONTI,
    Defendant-Appellant.
    Appeal from the United States District Court for the Northern District of Ohio in
    case no. 5:06-CV-2691, Judge Sara Lioi.
    __________________________
    DECIDED: May 12, 2009
    __________________________
    Before MICHEL, Chief Judge, SCHALL, and PROST, Circuit Judges.
    MICHEL, Chief Judge.
    Jonathan Monti appeals from the district court's grant of summary judgment that
    Fitness Quest ("FQ") did not infringe Monti's patent and did not breach a confidentiality
    agreement with Monti. We heard oral argument on January 3, 2009. As explained
    herein, the district court's grant of summary judgment is affirmed in part and vacated in
    part, and the case is remanded.
    I.     BACKGROUND
    Monti is a named inventor on at least two patents relating to exercise equipment.
    In 2002, Monti tried to interest FQ in one of his ideas for an exercise machine. FQ and
    Monti entered into a confidentiality agreement under which FQ would not disclose or
    use confidential information provided by Monti.        FQ, however, decided against
    purchasing Monti's exercise machine idea.
    In October 2003, FQ began selling its "Ab Lounge" product line, which has been
    a commercial success. The Ab Lounge is a chair-like device on which users perform
    exercises similar to sit-ups. According to FQ, the Ab Lounge is based on the idea of
    another inventor, Wendy Wirth, and covered by Wirth's 
    U.S. Patent No. 5,681,250
    .
    
    U.S. Patent No. 6,932,749
     (the '749 patent) was issued to Monti and a co-
    inventor on August 23, 2005. The asserted claims of the '749 patent are directed to an
    exercise apparatus that provides support for portions of a user's body during exercise.
    In July 2006, Monti sent FQ a letter in which he stated that the Ab Lounge
    infringed the '749 patent and was based on Monti's 2002 confidential disclosures to FQ.
    FQ responded over a month later, denying Monti's accusations. In November of 2006,
    FQ sought a declaratory judgment that it neither violated the parties' confidentiality
    agreement nor infringed the '749 patent. Monti filed corresponding counterclaims.
    The district court held a formal Markman hearing and construed a multitude of
    claim terms. Fitness Quest Inc. v. Monti, No. 5:06-CV-02691, 2007 U.S. Dist. Lexis
    60195 (N.D. Ohio Aug. 16, 2007).        Shortly before trial, FQ moved for summary
    judgment of non-infringement as to the asserted claims of the '749 patent (claims 15,
    20, and 28). See Fitness Quest Inc. v. Monti, 
    560 F. Supp. 2d 598
    , 601 (N.D. Ohio
    2008-1433                               2
    2008).       Resolving this motion required the district court to engage in further claim
    construction, see 
    id. at 604-09
    , and the constructions Monti challenges on appeal stem
    from this summary judgment ruling rather than the Markman order. The district court
    found that the Ab Lounge did not satisfy several limitations of the asserted claims and
    granted FQ's motion. See Fitness Quest, 
    560 F. Supp. 2d at 611
    . FQ also moved for
    summary judgment that it did not breach the confidentiality agreement, which the district
    court granted. 
    Id.
    Monti appealed, and we have jurisdiction pursuant to 
    28 U.S.C. § 1295
    (a)(1). 1
    II.       DISCUSSION
    "We review summary judgment decisions de novo, reapplying the standard used
    by the district court." Freedman Seating Co. v. Am. Seating Co., 
    420 F.3d 1350
    , 1356
    (Fed. Cir. 2005). Summary judgment is appropriate "if the pleadings, the discovery and
    disclosure materials on file, and any affidavits show that there is no genuine issue as to
    any material fact and that the movant is entitled to judgment as a matter of law." Fed.
    R. Civ. P. 56(c).
    A.       Infringement
    There are two steps to infringement analysis: "first, the claims are construed, and
    second, the properly construed claims are applied to the accused devices."            Elbex
    Video, Ltd. v. Sensormatic Elecs. Corp., 
    508 F.3d 1366
    , 1370 (Fed. Cir. 2007). Claim
    1
    Before oral argument, we issued an order directing the parties to be
    prepared to discuss whether appellate jurisdiction existed over this appeal because it
    was unclear whether the district court had resolved declaratory judgment claims for
    invalidity and unenforceability of the '749 patent. At oral argument, Monti explained that
    the district court dismissed FQ's invalidity counterclaim, which FQ does not challenge
    on appeal. FQ stated that there was never a claim for unenforceability before the
    district court, and that FQ had instead raised unenforceability as an affirmative defense
    to Monti's counterclaim of patent infringement.
    2008-1433                                   3
    construction is a question of law reviewed de novo. Cybor Corp. v. FAS Techs., 
    138 F.3d 1448
    , 1454 (Fed. Cir. 1998) (en banc). Likewise, we review a district court’s grant
    of summary judgment of non-infringement de novo. O2 Micro Int’l v. Monolithic Power
    Sys., 
    467 F.3d 1355
    , 1369 (Fed. Cir. 2006).
    To construe a claim term, a court must determine the meaning of any disputed
    words from the perspective of one of ordinary skill in the pertinent art at the time the
    patent application was filed. Phillips v. AWH Corp., 
    415 F.3d 1303
    , 1313 (Fed. Cir.
    2005) (en banc). In determining the meaning of a disputed claim limitation, courts look
    primarily to the intrinsic evidence of record, examining the claim language, the
    specification, and the prosecution history.    
    Id. at 1312-17
    .    Absent evidence to the
    contrary, words of a claim "are generally given their ordinary and customary meaning"
    as understood by a person of ordinary skill in the art. 
    Id. at 1312-13
    .
    Claims, however, "do not stand alone" and are read within the context of the
    specification, which is the single best guide to the meaning of disputed terms. 
    Id. at 1315
    . The specification may expressly or impliedly define a claim term contrary to its
    ordinary meaning. See 
    id. at 1321
    . Similarly, the specification may contain a clear
    disavowal of claim term scope. Voda v. Cordis Corp., 
    536 F.3d 1311
    , 1320 (Fed. Cir.
    2008). On the other hand, "[i]n examining the specification for proper context" it is
    improper to "import limitations from the specification into the claims." CollegeNet, Inc. v.
    ApplyYourself, Inc., 
    418 F.3d 1225
    , 1231 (Fed. Cir. 2005).                And, of particular
    importance to this appeal, "claim terms are presumed to be used consistently
    throughout the patent." Research Plastics, Inc. v. Fed. Packaging Corp., 
    421 F.3d 1290
    , 1295 (Fed. Cir. 2005).
    2008-1433                                4
    "Where the parties do not dispute any relevant facts regarding the accused
    product . . . but disagree over possible claim interpretations, the question of literal
    infringement collapses into claim construction and is amenable to summary judgment."
    Gen. Mills, Inc. v. Hunt-Wesson, Inc., 
    103 F.3d 978
    , 983 (Fed. Cir. 1997).
    Monti assigns error to the district court's rulings related to four limitations:
    "selectively applying a force," "back extensions," "body pad," and "transversely oriented
    support." All asserted claims contain versions of each of these limitations, except that
    "back extensions" is absent from claim 28.
    1.     "Back extensions"
    The district court ruled that Monti had defined "back extensions" in the
    specification in such a way as to exclude all pushing movements. Fitness Quest, 
    560 F. Supp. 2d at 607
    . The district court determined that a user could not perform a back
    extension on FQ's accused device without pushing, and on that basis granted FQ
    summary judgment of non-infringement as to claims 15 and 20. 2 
    Id.
     at 607-08 & n.7.
    a.     Claim construction
    The district court ruled that the following passage from the specification
    constitutes a clear disavowal of all pushing for back extensions:
    A back extension is the backward movement of the torso and upper body
    to straight posture. Kinesiologically, this is characterized by the pulling of
    the lower back and postural muscles to extend the torso so that a person
    can assume straight posture. Many Nautilus® type machines have been
    constructed in the prior art to mimic this movement and add resistance to
    it, biomechanically, the core movement of this type of machine was a
    pushing movement. [sic] This is a distinct disadvantage of the prior art
    2
    When discussing the "back extensions" limitation, the summary judgment
    order typically refers to claims 15 and 20, see Fitness Quest, 
    560 F. Supp. 2d at 606, 608
    , but in one instance, refers to claims 15 and 28, 
    id. at 607
    . The parties agree the
    reference to claim 28 is a typographical error.
    2008-1433                                5
    methods of back extension. Also, this does not fall within the scope of
    Kinesiologically Correct™ which has been stated already hereinbefore.
    '749 Pat. at 4:42-53.    Were this apparent definition of "back extensions" the only
    discussion of the term in the specification, the district court would be correct that Monti
    clearly disavowed claiming any back extensions based on a pushing motion. However,
    the district court did not discuss the paragraphs immediately following, which describe
    an additional group of exercises as "back extensions":
    Another form of back extension is the prone body weight resistive
    type. This movement is done when an exerciser is in a prone position,
    thereby allowing gravity to affect the weight of the torso. The exerciser
    now controls and declines their [sic] torso and then returns to a parallel
    position, thereby exerting force on the lower back and postural
    musculature.
    In making the torso lighter when conducting a back extension on
    the present invention, several advantages are realized. The most specific
    and greatest general advantage of the present invention is that it allows
    the user who is a patient in physical therapy and exercisers of particular or
    gross weaknesses the ability to perform prone body weight resistive back
    extension and related exercises that they normally would not be able to do
    with any of the devices or methods of the prior art. Another greater and
    specific advantage of the present invention is that the counter balance
    buoyancy effect takes the emphasis off of the larger musculature namely
    the hamstrings and glutes and puts it on the para spinal muscles of the
    lower back. Another specific advantage of this present invention is that
    the exerciser can twist at the top of the range of motion, this targets one
    para spinal which is very difficult to realize in any of the prior art methods.
    A further specific advantage of this present invention is that extension
    exercises can be performed uni-laterally with one leg. A still further
    specific advantage of the present invention is that it is performed with a
    Kinesiologically Correct™ pulling movement as opposed to the prior art
    Nautilus® type machines that perform an incorrect and unnatural pushing
    movement hereinbefore described. In making the torso heavier the
    present invention imparts a very challenging mode of Kinesiologically
    Correct™ movements.
    Id. at 4:54-5:18 (emphasis added). Figure 7 "is a side view of the variable gravity
    machine in use for back extension exercise." Id. at 7:51-52.
    2008-1433                                6
    Specifically, figure 7
    is a side view of the variable gravity machine in use for back extension
    exercise. In performing a back extension on the variable gravity machine,
    the user interfaces with the machine as shown wherein the ventral part of
    the user's torso contacts the guide arm; wherein the body pad is set at an
    angle and is contacted with the user's thigh; wherein the lower body
    support is set at an angle close to parallel to the floor and the user's feet
    engage the rollers to provide stability to perform the exercise. During the
    assistive exercise, the gas spring and guide arm are in a position as
    shown, the weight of the declining body causes the guide arm to rotate
    towards the floor thereby causing the force production as described in
    FIG. 4. During resistive exercise, the gas spring (23) is selected for the
    resistive position and the guide arm (31) is selected to a hole in the dial
    plate force transferring mechanism (28) which positions the user in a
    desired position to exert added resistance to the torso. During the
    resistive exercise, the user pulls upon the guide arm (31) by grasping the
    pads (37) of the guide arm (31) thereby exhibiting the resistive force as
    described in FIG. 6.
    Id. at 10:31-50 (emphasis added).
    Monti argues that the phrase "the weight of the declining body causes the guide
    arm to rotate towards the floor" indicates that "back extensions" in view of the
    specification must include some pushing movements.            Monti's reading would be
    plausible if not for the clear criticism of the Nautilus-type pushing movements. See id.
    2008-1433                                7
    at 4:46-53, 5:11-15. Reading the specification "as a whole," as courts must, one way to
    harmonize (a) the disavowal of pushing with (b) the weight of a user's torso driving the
    guide arm towards the floor is by limiting "pushing" to an active motion requiring muscle
    exertion. Excluding a user passively resting her weight on the guide arm from "pushing"
    thus gives "back extensions" a coherent meaning throughout the specification.
    An alternative way to harmonize these statements (and the one the district court
    used) is to limit "back extensions" to moving from a position where a user is bent at the
    waist to one in which her body is straight. Fitness Quest, 
    560 F. Supp. 2d at 607
    ("'[B]ack extensions' is limited to those extensions where a user is not pushing against
    the transversely oriented support as she moves the torso and upper body backward to
    straight posture."). Under this interpretation, moving from a straight posture to a bent
    posture is not part of a "back extension."
    Under either reading, we must reject Monti's argument that the '749 patent does
    not disclaim "all pushing movements, but" only "kinesiologically incorrect pushing
    movements." Thus, it is irrelevant if a user pushes when moving from a straight position
    to bending at the waist—this movement is not a "back extension" as defined in the '749
    patent.
    b.     Infringement analysis
    The parties agree that the Ab Lounge is used by pushing, not pulling; in fact,
    Monti's expert explained that someone using the Ab Lounge is "always pushing at least
    with his or her weight against the transversely oriented support." Since a user only
    pushes against the Ab Lounge when moving from a bent to a straight posture, she is not
    performing a "back extension" within the meaning of the '749 patent. The district court
    2008-1433                                8
    therefore correctly granted summary judgment of non-infringement as to claims 15 and
    20. 3
    2.    "Horizontally    oriented   body    pad"    and   "transversely    oriented
    support"
    The district court ruled that the "body pad" of the Ab Lounge was not "horizontally
    oriented," and that the Ab Lounge lacked a "transversely oriented support." Fitness
    Quest, 
    560 F. Supp. 2d at 608-09
    . Monti alleges that the district court's errors on these
    points have a common root.
    a.     Claim construction
    When analyzing the "body pad" limitation, the district court focused on claim 15
    of the '749 Patent. Claim 15 requires, inter alia, "a horizontally oriented body pad with a
    first end and a second end, the body pad having a longitudinal axis and a lateral extent
    extending perpendicular to the longitudinal axis and between a first side of the body pad
    and a second side of the body pad." 4 (Emphasis added). Claim 28 contains essentially
    the same language. 5 Claim 15 also requires a "transversely oriented support extending
    3
    Because the district court correctly determined that FQ did not infringe
    claim 15, we necessarily reject Monti's argument that the district court should have
    granted summary judgment in his favor on the issue of infringement of claim 15.
    4
    Claim language involving "sides" and "ends" has been used as a
    somewhat obtuse way to describe a rectangular structure in a patent. See, e.g., 
    U.S. Patent No. 5,240,109,
     claim 3 ("The shipping carton of claim 2 wherein the base of the
    box comprises a first end, a second end, a first side and a second side."); U.S. Patent
    5,703,327, claim 1 (". . . a first substantially rectangular end panel having first and
    second end edges and first and second side edges . . ."); 
    U.S. Patent No. 6,408,797,
    claim 1 (". . . a floor panel having a pair of parallel sides and a pair of ends extending
    between the sides . . .").
    5
    Claim 28 recites "a horizontally oriented body pad with a first end and a
    second end and an auxiliary body support adjustably coupled to the user support and
    extending from the second end of the user support adjacent the second end of the body
    pad, the body pad having a longitudinal axis and a lateral extent extending
    2008-1433                                 9
    substantially across the entire lateral extent of the body pad."      (Emphasis added).
    Claim 28 instead requires a "transversely oriented support extending substantially
    across the entire lateral extent of the user support." (Emphasis added). (Neither the
    parties nor the district court attachs much significance to this difference between claims
    15 and 28, see e.g., Fitness Quest, 560 F. Supp. 2d. at 609 n.9, and we therefore
    assume that this difference is not relevant to this appeal.)
    The district court, accepting Monti’s argument on this point, determined that
    "body pad," as well as the "first end" and "second end" of the body pad, needed no
    construction.    Fitness Quest, 2007 U.S. Dist. Lexis 60195 at *9, *15, *33-34.       The
    parties agreed that these terms should be construed identically for claims 15 and 28.
    
    Id. at *33-34
    . Monti does not challenge the district court's claim construction on appeal.
    b.   Infringement analysis for "body pad"
    FQ's accused device has a back and seat outlined by what is essentially a
    tubular steel rectangle with a pair of hinges joining the back and seat sections of this
    frame. A single, continuous piece of fabric forms both the seat and the back portions of
    FQ's accused device, and is depicted in the Ab Lounge manual:
    perpendicular to the longitudinal axis and between a first side of the body pad and a
    second side of the body pad," with emphasis added to show the language that does not
    appear in the corresponding section of claim 15.
    2008-1433                                10
    Monti argued to the district court that the seat of FQ's accused device constituted
    the "body pad" of claims 15 and 28, and the back constituted the "transversely oriented
    support." Fitness Quest, 
    560 F. Supp. 2d at 608-09
    . The district court began with the
    assumption that the seat of the Ab Lounge indeed corresponded to the "body pad" of
    the '749 patent. 
    Id. at 608
    . The district court determined that the three distinct edges of
    the seat (the two side edges and the front edge) constituted three of the recited "first
    side," "second side," "first end," and "second end," but that because only a single piece
    of fabric formed both the seat and back of the Ab Lounge, there was no determinate
    fourth boundary of the seat. 
    Id.
     The court then reasoned that because the fabric of the
    seat and back of the Ab Lounge was of one continuous piece, the upper edge of the
    back of the Ab Lounge must therefore be the fourth boundary of the "body pad," and
    2008-1433                               11
    that the "body pad" therefore corresponded to both the seat and back of the Ab Lounge.
    
    Id. at 609
    . Because the back of the Ab Lounge is (at least when the device is not in
    use) 8 degrees from vertical, the district court determined that the "body pad" is not
    "horizontally oriented." 
    Id.
    Monti argued to the district court that the phrase "transversely oriented support
    extending substantially across the entire lateral extent of the body pad" of claim 15
    means that the transversely oriented support is at an elevation above the body pad. 
    Id.
    The district court accepted this construction for the sake of argument. 
    Id.
     Then, relying
    on its determination that the seat and back of the Ab Lounge constituted the "body pad,"
    the district court concluded that the "transversely oriented support" (i.e., the Ab Lounge
    back) could not be above itself (i.e., the Ab Lounge seat and back). 
    Id.
     The court
    alternatively ruled that the '749 patent required the "body pad" and "transversely
    oriented support" to be distinct structures, and that the back and seat of the Ab Lounge
    were not distinct because they were formed from a continuous piece of fabric. 
    Id.
     at
    609 n.9.
    Were the facts pertinent to the infringement analysis undisputed, we would treat
    the analysis of whether the Ab Lounge satisfies the "body pad" limitation (the
    construction of which is unchallenged) as a question of law. But here, the facts were
    not completely undisputed. The district court stated:
    The differences in opinion of the parties' experts about how to
    measure the length of the "body pad" is illustrative. FQ's expert measures
    from both the seat pivot bolt and the chairback pivot bolt to the front of the
    device. Monti's expert measures the seat's length from the intersection of
    the seat and the chair's back to the front of the device.
    2008-1433                                12
    Fitness Quest, 
    560 F. Supp. 2d at 608
     (citations omitted). Neither of these experts,
    however, used the top of the Ab Lounge back as one endpoint for their measurements.
    While these experts produced slightly different measurements for the length of the
    "body pad," all measurements were around 20 inches. The top edge of the Ab Lounge
    back is a significantly different location than any of the three possibilities identified in the
    evidence discussed by the district court. Additionally, at his deposition, Monti's expert
    testified that he "would identify the body pad to be the seat" of the Ab Lounge and that
    the fourth boundary of this "body pad" was "at the back edge of the seat."
    The district court disregarded Monti's expert's testimony regarding the location of
    the end of the seat, saying, "This intersection point chosen by Monti's expert is arbitrary,
    though, because the fabric is all one piece. Discerning the length of the seat is difficult
    precisely because the fabric has no defined stopping point in this direction, besides
    going all the way up to the top of the machine." 
    Id. at 608-09
    . However, the district
    court identified no basis for its requirement that the "end" be a "defined stopping point,"
    despite Monti's evidence that the seat of the Ab Lounge had a fourth boundary. The
    district court did not construe the term "end" and neither side asks us to construe the
    term on appeal; in the absence of a contrary claim construction, the district court erred
    by limiting the meaning of the term "end" to an end with a "defined stopping point."
    "[T]he fundamental premise of a grant of summary judgment is that no
    reasonable jury could find other than in favor of the movant, when all reasonable factual
    inferences are drawn in favor of the non-movant." Gemmy Indus. Corp. v. Chrisha
    Creations Ltd., 
    452 F.3d 1353
    , 1359 (Fed. Cir. 2006). Neither the parties on appeal nor
    the district court in its opinion identified any evidence supporting the notion that the top
    2008-1433                                 13
    edge of the Ab Lounge back is the fourth boundary of the "body pad." The district court
    overlooked evidence contrary to its conclusion and settled on a conclusion lacking any
    evidentiary support, making summary judgment inappropriate.
    The district court did not determine if, using the measurements of either expert,
    the Ab Lounge would satisfy the "body pad" limitation. However, "the mere existence of
    some alleged factual dispute between the parties will not defeat an otherwise properly
    supported motion for summary judgment. . . . Only disputes over facts that might affect
    the outcome of the suit under the governing law will properly preclude the entry of
    summary judgment." Anderson v. Liberty Lobby, Inc., 
    477 U.S. 242
    , 247-48 (1986). If
    the answer to the question of whether the Ab Lounge would satisfy the "body pad"
    limitation is the same regardless of which point was taken to be the fourth boundary of
    the "body pad" (such as the seat pivot bolt, the chairback pivot bolt, or the intersection
    of the seat and the chair's back), there is no disputed issue of material fact and the
    district court should grant summary judgment. We will remand the case to the district
    court to make this determination. 6 Furthermore, because the district court—ignoring a
    factual dispute as to the location of the end of the body pad—decided that the "body
    pad" comprised the seat and back of the Ab Lounge, the district court's ruling that the
    "horizontally oriented support" (i.e., the back of the Ab Lounge) was not at an elevation
    above the "body pad" cannot stand.
    6
    We reject Monti's cursory argument that the district court should have
    granted summary judgment in his favor on the issue of infringement of claim 28. While
    the district court's reasons for finding that the Ab Lounge did not satisfy the "body pad"
    limitation were incorrect, this does not necessarily mean that the Ab Lounge does
    satisfy the "body pad" limitation.
    2008-1433                               14
    3.     "Selectively applying a force"
    At the claim construction hearing, FQ argued that "selectively" connoted
    selection by the user, while Monti argued that the machine performed the selection.
    Fitness Quest, 2007 U.S. Dist. Lexis 60195 at *23-24. Specifically, Monti argued that
    "selectively applying a force" should be construed to mean "the force producing
    assembly applying an appropriate force to bias the guide member as needed during the
    exercise"; the district court adopted this construction. 7 Fitness Quest, 
    560 F. Supp. 2d at
    605 n.5. In explaining his position, Monti argued
    So the force producing assembly in Claim 15 is talking about something
    different. It's not talking about what the user could do, it's talking about
    what the, what the system can do.
    Why? Because what happens is, within the system there may be a
    120 pound load on it, or maybe a 220 pound man.
    So what the system has to do in the force producing assembly is it
    has to be selective. How much energy am I going to absorb? How much
    energy do I need to have this person complete the exercise? That's
    where the selective comes in. It's the system itself, the assembly itself
    that's selecting the amount of energy that's needed to complete the
    exercise, to assist.
    It's not, it's not some third party, it's not the user that's doing this.
    The user, and the fact that you can have this dial up here that can be
    adjusted, that's in claim 16, 17, 29 and 30.
    ....
    Claim 15 is the system itself selectively applying the force to bias
    the guide member.
    This goes back to the point I made before. You may have a 250
    pound man or you may have a 120 pound woman, and they are both
    using the same system. The system has to do a selection in terms of
    what, what amount of energy does it have so that it can then assist the,
    the user when they are moving against gravity.
    7
    On appeal, neither party challenges this claim construction.
    2008-1433                                15
    In its motion for summary judgment, FQ argued that it was entitled to summary
    judgment because it was "undisputed that the bungees of the Ab Lounge (which Monti
    claims constitute the 'force producing assembly') do not apply force based on the weight
    of the user, but only based on how tightly they are pulled due to the angular
    displacement of the chair's back." 
    Id.
     The district court ruled that Monti was bound
    under the doctrine of judicial estoppel by his example of users of different weights:
    Monti clearly advocated that the system must determine that amount of
    force to apply with reference to the weight of the individual using the
    device. This position is directly contrary to his current position, which is
    that the force producing assembly applies a force irrespective of the user's
    weight. The Court adopted Monti's previous construction and finds that
    FQ would suffer an unfair detriment if Monti was not estopped because
    Monti could defeat summary judgment by assuming a contrary position
    now that the facts show his prior position is unhelpful to him.
    
    Id. at 606
    . The district court therefore did not allow Monti to argue that "the force
    producing assembly stores energy according to the angular displacement of the guide
    member, and then applies a degree of force based on that angular displacement,
    regardless of the user's weight or other needs." See 
    id. at 605
    . The district court then
    determined that because "[t]he undisputed evidence shows that the bungee cords of the
    Ab Lounge apply force to the chair regardless of the user's weight . . . [s]ummary
    judgment of noninfringement is therefore warranted." 
    Id. at 606
    .
    Monti argues that judicial estoppel was not warranted in this situation for a host
    of reasons. While we do not need to address each of his contentions, we do agree that
    the district court erred by applying judicial estoppel in this situation.
    Monti asserts that issues of judicial estoppel are decided under regional circuit
    law, which FQ does not challenge. "Whether judicial estoppel applies is a matter of
    regional circuit law." Minn. Mining & Mfg. Co. v. Chemque, Inc., 
    303 F.3d 1294
    , 1302
    2008-1433                                  16
    (Fed. Cir. 2002). According to the Supreme Court, the primary factors for determining
    whether judicial estoppel should apply are as follows:
    First, a party's later position must be “clearly inconsistent” with its earlier
    position.     Second, courts regularly inquire whether the party has
    succeeded in persuading a court to accept that party's earlier position, so
    that judicial acceptance of an inconsistent position in a later proceeding
    would create the perception that either the first or the second court was
    misled. Absent success in a prior proceeding, a party's later inconsistent
    position introduces no risk of inconsistent court determinations, and thus
    poses little threat to judicial integrity. A third consideration is whether the
    party seeking to assert an inconsistent position would derive an unfair
    advantage or impose an unfair detriment on the opposing party if not
    estopped.
    New Hampshire v. Maine, 
    532 U.S. 742
    , 750-51 (2001) (citations and quotations marks
    omitted). Despite the Supreme Court's observation that "[b]ecause the rule is intended
    to prevent improper use of judicial machinery, judicial estoppel is an equitable doctrine
    invoked by a court at its discretion," 
    id. at 750
     (citations and quotation marks omitted),
    the Sixth Circuit "review[s] a district court's application of judicial estoppel de novo,"
    Eubanks v. CBSK Fin. Group, 
    385 F.3d 894
    , 897 (6th Cir. 2004). 8
    Judicial estoppel can apply to claim construction arguments.              See, e.g.,
    Interactive Gift Express v. Compuserve Inc., 
    256 F.3d 1323
    , 1349 (Fed. Cir. 2001).
    Here, however, the analysis falters on the first prong; Monti's position from the claim
    construction hearing was not "clearly inconsistent" with his position from the summary
    judgment motions. Cf. SanDisk Corp. v. Memorex Prods., 
    415 F.3d 1278
    , 1291 (Fed
    Cir. 2005) (finding no "clearly inconsistent" positions despite appellee definitively
    advocating for different claim constructions before and after grant of preliminary
    8
    FQ points out that in an unpublished decision, Lewis v. Weyerhaeuser
    Co., 
    141 Fed. Appx. 420
    , 423-24 (6th Cir. 2005), the Sixth Circuit questioned the
    appropriateness of de novo review in light of New Hampshire, but admirably concedes
    this is the "minority" view within the Sixth Circuit.
    2008-1433                               17
    injunction). Monti's example of the 120-pound woman and 250-pound man appears to
    have been an attempt to explain the difference between a machine "selectively
    applying" an amount of force as recited in independent claim 15 from a user "selectively
    adjusting" the amount of force in dependent claim 16.               This was not "clearly
    inconsistent" with his arguments on summary judgment, making the application of
    judicial estoppel inappropriate. 9
    Because of the errors in the district court's rulings related to the terms "body
    pad," "transversely oriented support," and "selectively applying a force, the grant of
    summary judgment of non-infringement of claim 28 is vacated. 10
    B.     Breach of contract
    The 2002 confidentiality agreement between FQ and Monti prohibited FQ from
    using confidential information from Monti, but contained exceptions for information
    which FQ already knew or learned from another source. Fitness Quest, 506 F. Supp.
    2d at 610. Monti states on appeal that he disclosed to FQ "the benefit of lowering the
    pivot point where the force producing assembly is mechanically linked to the guide
    member," and that FQ breached the confidentiality agreement by using this information
    9
    On remand, the district court may determine whether it should grant
    summary judgment to either party based on the unchallenged construction of
    "selectively applying a force" as "the force producing assembly applying an appropriate
    force to bias the guide member as needed during the exercise" without applying judicial
    estoppel.
    10
    Because we are remanding for further proceedings regarding FQ's alleged
    literal infringement of claim 28, we do not reach the issue of whether Monti's expert's
    testimony regarding infringement under the doctrine of equivalents was erroneously
    excluded. See, e.g., Biagro W. Sales, Inc. v. Grow More, Inc., 
    423 F.3d 1296
    , 1304-05
    (Fed. Cir. 2005) (reaching infringement under the doctrine of equivalents after upholding
    determination of no literal infringement). The district court is free to revisit this issue or
    determine whether additional evidence is needed on remand.
    2008-1433                                 18
    in designing the Ab Lounge. Monti argues that the district court erroneously granted
    summary judgment to FQ because the evidence the district court considered showed
    that FQ knew of a lowered pivot point before entering into the confidentiality agreement,
    but not that FQ knew of the benefit of lowering a pivot point. Accepting, arguendo,
    Monti's characterization of the district court's ruling, his argument nevertheless fails.
    Monti cites two pieces of evidence in support of his contention: a video of him
    using a machine with a supposedly lowered pivot point and an e-mail. The video has no
    sound and no text. Monti's expert testified that by viewing the lowered pivot point in the
    video, he could discern the benefits of lowering the pivot point. However, Monti does
    not challenge the district court's finding that a lower pivot point was known to FQ before
    the parties entered into the confidentiality agreement. Monti cannot have this both
    ways—either disclosure of a lower pivot point necessarily discloses the benefit of
    lowering a pivot point (in which case FQ knew the benefit before entering into the
    confidentiality agreement), or disclosure of a lower pivot point does not disclose the
    benefit of lowering a pivot point (in which case the video does not disclose the benefit of
    lowering a pivot point). Either way, the video cannot serve as the basis for overturning
    the district court's ruling.
    Monti's e-mail reads, in part: "After using the machine I noticed that it would be
    better for me to take the back extension out and lower the pivot point. Now the machine
    is very well situated for sit-ups, push-ups and leg lifts." It is possible to read this e-mail
    as disclosing that both (1) removing the back extension and (2) lowering the pivot point
    together makes the machine "very well situated for sit-ups, push-ups and leg lifts."
    However, even under this reading (the most favorable one to Monti), this e-mail does
    2008-1433                                 19
    not disclose that lowering the pivot point alone has any benefit. The district court was
    therefore correct to grant FQ summary judgment that it did not breach the confidentiality
    agreement, as Monti did not prove he disclosed to FQ the benefit of lowering the pivot
    point.
    CONCLUSION
    For the reasons provided above, we affirm the district court's grant of summary
    judgment that FQ does not infringe claims 15 or 20 of the '749 patent, but vacate the
    district court's grant of summary judgment that FQ does not infringe claims 28 of the
    '749 patent. We also affirm the grant of summary judgment that FQ did not breach the
    confidentiality agreement. We remand for further proceedings in accordance with this
    opinion.
    2008-1433                               20