Case: 22-1393 Document: 42 Page: 1 Filed: 10/24/2023
NOTE: This disposition is nonprecedential.
United States Court of Appeals
for the Federal Circuit
______________________
MASIMO CORPORATION,
Appellant
v.
SOTERA WIRELESS, INC.,
Appellee
______________________
2022-1393
______________________
Appeal from the United States Patent and Trademark
Office, Patent Trial and Appeal Board in No. IPR2020-
00967.
______________________
Decided: October 24, 2023
______________________
JEREMIAH HELM, Knobbe, Martens, Olson & Bear, LLP,
Washington, DC, argued for appellant. Also represented
by JAROM D. KESLER, STEPHEN W. LARSON, Irvine, CA.
RUDOLPH A. TELSCHER, JR., Husch Blackwell LLP, St.
Louis, MO, argued for appellee. Also represented by
JENNIFER E. HOEKEL, DAISY MANNING.
______________________
Case: 22-1393 Document: 42 Page: 2 Filed: 10/24/2023
2 MASIMO CORPORATION v. SOTERA WIRELESS, INC.
Before PROST, WALLACH, and CHEN, Circuit Judges.
PROST, Circuit Judge.
Masimo Corporation (“Masimo”) appeals from an inter
partes review final written decision determining all claims
of U.S. Patent No. RE47,244 (“the ’244 patent”) are un-
patentable. Sotera Wireless, Inc. v. Masimo Corp., No.
IPR2020-00967,
2021 WL 6338280 (P.T.A.B. Nov. 19, 2021)
(“Board Decision”). For the following reasons, we affirm.
BACKGROUND
The ’244 patent, titled “Alarm Suspend System,” is as-
signed to Masimo. It relates to an alarm suspension sys-
tem for medical alarms where the duration of an alarm
delay or suspension is responsive to the specific physiolog-
ical parameter measured. ’244 patent col. 2 l. 18–col. 4. l.
8. The ’244 patent delays or suspends these alarms “so as
to prevent unnecessary disturbance to the patient and dis-
traction of the caregiver.”
Id. at col. 2 ll. 34–36.
Claims 1, 13, and 18 are independent. Claim 13 is il-
lustrative and states:
A method of electronically delaying or suspend-
ing an alarm while an electronically calculated
measurement of a physiological parameter sat-
isfies an alarm activation threshold, the meas-
urement of the physiological parameter
responsive to a signal from a noninvasive sen-
sor positioned at a monitored patient, the
method comprising:
electronically processing a signal from a nonin-
vasive sensor;
responsive to processing the signal, electroni-
cally determining a first measurement of a first
physiological parameter and a second measure-
ment of a second physiological parameter using
a patient monitoring device, the patient
Case: 22-1393 Document: 42 Page: 3 Filed: 10/24/2023
MASIMO CORPORATION v. SOTERA WIRELESS, INC. 3
monitoring device including a processor and a
memory device;
electronically storing, using the patient moni-
toring device, a first parameter-specific alarm
delay or suspension period of time correspond-
ing to the first physiological parameter and a
second parameter-specific alarm delay or sus-
pension period of time corresponding to the sec-
ond physiological parameter, the first
parameter-specific alarm delay or suspension
period of time being different from the second
parameter-specific alarm delay or suspension
period of time;
electronically determining, using the patient
monitoring device, that the first measurement
of the first physiological parameter satisfies a
first alarm activation threshold;
electronically initiating, using the patient mon-
itoring device, the first parameter-specific
alarm delay or suspension period of time; and
electronically activating, using the patient
monitoring device, a first alarm for the first
physiological parameter in response to expira-
tion of a first amount of delay or suspension as-
sociated with the first parameter-specific alarm
delay or suspension period of time.
’244 patent claim 13 (emphasis added).
Sotera Wireless, Inc. (“Sotera”) petitioned for inter
partes review of all claims of the ’244 patent. Sotera ar-
gued obviousness on four grounds using
U.S. Patent No.
5,865,736 (“Baker”) as a reference and on two grounds us-
ing U.S. Patent Publication No. 2005/0038332 (“Saidara”)
as a reference. The Board determined all claims are un-
patentable on the Saidara grounds. Masimo timely
Case: 22-1393 Document: 42 Page: 4 Filed: 10/24/2023
4 MASIMO CORPORATION v. SOTERA WIRELESS, INC.
appealed, and we have jurisdiction under
28 U.S.C.
§ 1295(a)(4)(A).
DISCUSSION
Masimo argues that the Board erred by incorrectly con-
struing several claims and by improperly concluding that
the prior art rendered the claims of the ’244 patent obvious.
Specifically, Masimo argues: (1) that claims 1 and 13 re-
quire the noninvasive measurement of two physiological
parameters; (2) that the Board erred by not giving claim 18
a means-plus-function construction; and (3) that the Board
erred by construing the “parameter-specific alarm delay or
suspension period of time” limitation to encompass only
pre-alarm delays. Masimo also independently argues that
the Board’s obviousness determinations cannot stand be-
cause several of its factual findings are unsupported by
substantial evidence. We address each argument in turn.
I
We review the Board’s ultimate claim construction and
any determinations based on intrinsic evidence de novo
and review subsidiary factual findings involving extrinsic
evidence for substantial evidence. Personalized Media
Commc’ns, LLC v. Apple Inc.,
952 F.3d 1336, 1339 (Fed.
Cir. 2020). We address Masimo’s claim construction argu-
ments in the order discussed above.
A
Regarding the first claim-construction dispute,
Masimo argues that the Board erred by determining all
claims were obvious over Sotera’s proposed combination
consisting of one physiological parameter measured from a
noninvasive sensor and another physiological parameter
measured from an invasive sensor. Claim 13 recites “elec-
tronically processing a signal from a noninvasive sensor”
and “responsive to processing the signal, electronically de-
termining a first measurement of a first physiological pa-
rameter and a second measurement of a second
Case: 22-1393 Document: 42 Page: 5 Filed: 10/24/2023
MASIMO CORPORATION v. SOTERA WIRELESS, INC. 5
physiological parameter.” ’244 patent claim 13. Claim 1
similarly recites a “noninvasive physiological sensor” con-
figured to output a signal, where “responsive to processing
the signal,” the system “determine[s] a measurement of a
physiological parameter based at least in part upon the sig-
nal.”
Id. at claim 1. Claim 1 also recites “at least one other
physiological parameter for which the one or more proces-
sors are configured to determine at least one measure-
ment.”
Id. Claim 8, which depends from claim 1, further
recites “determin[ing] a measurement of a second physio-
logical parameter based at least in part upon the signal.”
Id. at claim 8.
Relying on this language, Masimo argues that claims 1
and 13 require the noninvasive measurement of two differ-
ent physiological parameters. Appellant’s Br. 23–28. So-
tera responds that Masimo did not present this issue as a
claim-construction dispute before the Board. We agree
with Sotera. None of Masimo’s arguments before the Board
presented or implicated a construction for claims 1 or 13
requiring the noninvasive measurement of two physiologi-
cal parameters. We therefore conclude that Masimo for-
feited this argument.
In its petition, Sotera stated that “Saidara discloses a
noninvasive sensor.” J.A. 236 (claim 1); see also J.A. 248
(claim 13). In its preliminary response, Masimo presented
proposed constructions for several terms, but it did not as-
sert how many parameters must be measured noninva-
sively in claims 1 and 13. J.A. 303–07. And in its post-
institution patent owner response, Masimo merely stated
that “Saidara focuses on invasive sensors,” J.A. 549, and
that Sotera’s expert “admitted Saidara does not teach a
[skilled artisan] how to monitor blood glucose noninva-
sively,” J.A. 562 n.7. Thus, the parties’ initial dispute con-
cerned the nature of Saidara’s disclosure—not how many
parameters must be measured noninvasively.
Case: 22-1393 Document: 42 Page: 6 Filed: 10/24/2023
6 MASIMO CORPORATION v. SOTERA WIRELESS, INC.
In the petitioner’s reply, Sotera stated that “Masimo
does not dispute Saidara discloses noninvasive sensors.”
J.A. 618 n.7. In the patent owner sur-reply, Masimo noted
that “[c]laims 1 and 13 require noninvasive sensors,” e.g.,
J.A. 678, and argued that Saidara discloses only invasive
sensors and monitors, J.A. 676, 678–79. Masimo’s argu-
ments thus again concerned the contents of the prior art
(namely, whether Saidara disclosed noninvasive sen-
sors)—not how many parameters must be measured non-
invasively.
The Board “recognize[d] [Masimo’s] argument that
claim 1 recites a noninvasive sensor,” Board Decision,
2021
WL 6338280, at *25, but concluded that Sotera demon-
strated a skilled artisan would have used a noninvasive
sensor, as described in Sotera’s proposed combination,
id.
Masimo’s argument on appeal—that two parameters
must be measured noninvasively—does not reflect the ar-
guments Masimo made before the Board. Masimo limited
its arguments before the Board to the disclosures of So-
tera’s prior-art combination. Under these circumstances,
we conclude that Masimo did not make this claim-construc-
tion argument before the Board. Masimo has thus forfeited
this argument. See In re Google Tech. Holdings LLC,
980
F.3d 858, 864 (Fed. Cir. 2020) (“Even under the most gen-
erous of readings, Google’s arguments below did not sug-
gest any definition of ‘network penalty,’ let alone the highly
particularized definition it presents on appeal.”).
B
Masimo’s second claim construction argument presents
an issue about whether Sotera complied with
37 C.F.R.
§ 42.104(b). We review decisions related to compliance
with the Board’s procedural requirements for abuse of dis-
cretion. Ericsson Inc. v. Intell. Ventures I LLC,
901 F.3d
1374, 1379 (Fed. Cir. 2018).
Case: 22-1393 Document: 42 Page: 7 Filed: 10/24/2023
MASIMO CORPORATION v. SOTERA WIRELESS, INC. 7
Masimo argues that Sotera’s failure to present a
means-plus-function construction for the limitation “a
physiological measurement system comprising: a physio-
logical sensor means . . . .” requires reversing the Board’s
unpatentability determination for claim 18. We disagree.
Masimo argues that the presence of “means” in claim
18 necessitates a means-plus-function construction. Ac-
cording to Masimo, Sotera’s failure to present a means-
plus-function construction for claim 18 signifies that So-
tera’s petition did not comply with
37 C.F.R. § 42.104(b)(3),
thus prohibiting the Board from determining claim 18 is
unpatentable.
Claim 18 does not warrant a means-plus-function con-
struction. Under our precedent, the use of “means” in a
claim does not require a means-plus-function construction
where the claim itself provides a sufficiently definite struc-
ture. Williamson v. Citrix Online, LLC,
792 F.3d 1339,
1348–49 (Fed. Cir. 2015) (en banc). Claim 18 recites “a
physiological sensor means,” while claim 1 recites “a non-
invasive physiological sensor.” ’244 patent claims 1, 18.
Masimo, understandably, does not argue that claim 1 lacks
a sufficiently definite structure or that the use of “physio-
logical sensor” renders claim 1 indefinite. See Oral Arg. at
12:22–35, No. 22-1393, https://oralarguments.
cafc.uscourts.gov/default.aspx?fl=22-1393_08092023.mp3
(agreeing that “physiological sensor” should not be under-
stood as a means-plus-function limitation and that “physi-
ological sensor” does not render claim 1 indefinite). The
use of “physiological sensor” in claim 1, combined with
Masimo’s failure to dispute that claim 1 recites adequate
structure, suggests that a skilled artisan would under-
stand the structure of a physiological sensor from the
words “physiological sensor” alone. We have determined
means-plus-function construction is not appropriate in
similar situations where the limitation preceding “means”
provides a sufficiently definite structure to a skilled arti-
san. Lighting Ballast Control LLC v. Philips Elecs. N. Am.
Case: 22-1393 Document: 42 Page: 8 Filed: 10/24/2023
8 MASIMO CORPORATION v. SOTERA WIRELESS, INC.
Corp.,
790 F.3d 1329, 1338–39 (Fed. Cir. 2015) (concluding
that a “voltage source means” provides sufficient structure
where a skilled artisan would understand that the voltage
source is a class of structures providing direct current volt-
age); TecSec, Inc. v. Int’l Bus. Machs. Corp.,
731 F.3d 1336,
1347–48 (Fed. Cir. 2013) (concluding that a “system
memory means” provides sufficient structure for the func-
tion of storing data).
We now address the Board’s determination that Sotera
complied with
37 C.F.R. § 42.104(b)(3) in light of our con-
clusion that claim 18 does not warrant a means-plus-func-
tion construction. Section 42.104(b)(3) states: “Where the
claim to be construed contains a means-plus-function or
step-plus-function limitation as permitted by
35 U.S.C.
§ 112(f), the construction of the claim must identify the spe-
cific portions of the specification that describe the struc-
ture, material, or acts corresponding to each claimed
function.” This regulation applies only where the limita-
tion at issue necessitates a mean-plus-function construc-
tion. Since we have concluded that claim 18 does not, the
Board did not abuse its discretion in determining that So-
tera complied with this regulation.
C
Masimo next argues that the Board’s construction of
the “parameter-specific alarm delay or suspension period
of time” limitation in claims 1, 13, and 18 was “gratuitous”
and incorrect. See Appellant’s Br. 50, 59.
Masimo’s argument that the Board gratuitously con-
strued “parameter-specific alarm delay or suspension pe-
riod of time” is meritless. Sotera petitioned for inter partes
review on six grounds—four grounds using Baker as a ref-
erence and two grounds using Saidara as a reference. So-
tera explained in its petition that it was presenting
alternative grounds for alternative constructions of “pa-
rameter-specific alarm delay or suspension period of time.”
The Baker grounds address obviousness under a
Case: 22-1393 Document: 42 Page: 9 Filed: 10/24/2023
MASIMO CORPORATION v. SOTERA WIRELESS, INC. 9
construction where the alarm delay term covers pre-alarm
delays, while the Saidara grounds address obviousness un-
der a construction where the alarm delay term covers only
post-alarm delays. J.A. 187 (“Grounds 1–4 [Baker] of this
Petition are directed to a construction encompassing delays
before an alarm is activated (i.e., pre-alarm delays), and
Grounds 5–6 [Saidara] are directed to temporary suspen-
sion of active alarms (i.e., post-alarm suspensions).”). The
Board did not err by construing the “parameter-specific
alarm delay or suspension period of time” limitation that
governed which grounds it would analyze in evaluating ob-
viousness.
The Board also correctly construed “parameter-specific
alarm delay or suspension period of time” to cover only
post-alarm delays or suspensions. We interpret patent
claims by looking to the claim language, the specification,
the prosecution history, and, where relevant, extrinsic evi-
dence. Phillips v. AWH Corp.,
415 F.3d 1303, 1314 (Fed.
Cir. 2005) (en banc). This interpretation is done “in the
context of the entire patent, including the specification.”
Id. at 1313.
Here, the claim language itself is not particularly in-
formative. Claims 1, 13, and 18 contain no language eluci-
dating whether the “parameter-specific alarm delay or
suspension period of time” limitation covers pre-alarm de-
lays or only post-alarm delays, nor do the dependent
claims. The specification, however, provides significant in-
formation regarding the scope of this limitation. The spec-
ification is uniform in its description of the alarm delay and
suspensions as post-alarm delays and suspensions. It re-
fers throughout to the silencing or suspending of audible or
active alarms and the reactivation of alarms. E.g., ’244 pa-
tent Abstract, Fig. 4, col. 2 ll. 33–38, col. 2 ll. 55–57, col. 2
ll. 61–63, col. 3 ll. 1–6, col. 3 ll. 31–32, col. 3 ll. 34–36, col. 3
ll. 43–47, col. 3 ll. 58–60, col. 3 l. 65–col. 4 l. 1, col. 4 ll. 46–
48, col. 4 ll. 58–60, col. 5 l. 42, col. 5 ll. 52–65, col. 6 ll. 1–
12. This uniformity of description leads us to conclude that
Case: 22-1393 Document: 42 Page: 10 Filed: 10/24/2023
10 MASIMO CORPORATION v. SOTERA WIRELESS, INC.
the ’244 patent uses “parameter-specific alarm delay or
suspension period of time” to mean a post-alarm delay or
suspension. See Trs. of Columbia Univ. v. Symantec Corp.,
811 F.3d 1359, 1368 (Fed. Cir. 2016) (construing “probabil-
istic model of normal computer system usage” in line with
the specification’s consistent disclosures).
We thus affirm the Board’s construction of “parameter-
specific alarm delay or suspension period of time.”
II
We turn now to Masimo’s obviousness arguments. We
review the Board’s legal conclusion of obviousness de novo
and review its subsidiary fact findings, including the scope
and content of the prior art and the presence or absence of
a motivation to combine, for substantial evidence. Intelli-
gent Bio-Sys., Inc. v. Illumina Cambridge Ltd.,
821 F.3d
1359, 1366 (Fed. Cir. 2016); Randall Mfg. v. Rea,
733 F.3d
1355, 1362 (Fed. Cir. 2013).
Masimo first argues that the Board lacked substantial
evidence to conclude that a skilled artisan would modify
Saidara by adding a noninvasive pulse oximeter that
measures blood oxygen levels to Saidara’s sensor set, both
as to the existence of a motivation to combine and the dis-
closure of a noninvasive sensor. We disagree. Substantial
evidence supports the Board’s findings that a skilled arti-
san would modify Saidara to noninvasively measure blood
oxygen levels by adding a noninvasive pulse oximeter to
Saidara’s sensor set. See J.A. 1644 ¶ [0076] (Saidara dis-
closing the monitoring of multiple physiological parame-
ters); J.A. 1496 ¶ 168 (Sotera’s expert explaining why a
skilled artisan would make the proposed combination); J.A.
3936 at 23:2–11 (Masimo’s expert agreeing a skilled arti-
san would use a noninvasive pulse oximeter to measure
blood oxygen levels).
Masimo also argues that the prior art does not disclose
multiple alarm delay or suspension periods of time for
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MASIMO CORPORATION v. SOTERA WIRELESS, INC. 11
different parameters, as required by the independent
claims. We disagree and conclude that substantial evi-
dence supports the Board’s findings that the prior art dis-
closes multiple alarm delay or suspension periods of time
for different parameters. J.A. 1644 ¶ [0073] (Saidara dis-
closing the use of multiple sensors and multiple measure-
ments); J.A. 1651 ¶ [0133] (Saidara disclosing a multiple
alarm function for blood sugar levels); J.A. 1498–99, 1501–
02 ¶¶ 174, 178 (Sotera’s expert explaining why a skilled ar-
tisan would modify Saidara to use multiple alarm timings);
J.A. 4237 at 324:3–17 (Masimo’s expert admitting that Sa-
idara discloses multiple sensors measuring multiple phys-
iological characteristics).
CONCLUSION
We have considered Masimo’s remaining arguments
and find them unpersuasive. For the foregoing reasons, we
affirm.
AFFIRMED
