Irobot Corporation v. Sharkninja Operating LLC, Sharkninja Management LLC, Sharkninja Sales Company,…

N OTE: This disposition is nonprecedential.
United States Court of Appeals
for the Federal Circuit
______________________
IROBOT CORPORATION,
Appellant
v.
SHARKNINJA OPERATING LLC, SHARKNINJA
MANAGEMENT LLC, SHARKNINJA SALES
COMPANY,
Cross-Appellants
______________________
2023-1398, 2023-1416
______________________
Appeals from the United States Patent and Trademark
Office, Patent Trial and Appeal Board in No. IPR2021-
00544.
______________________
Decided: August 7, 2024
______________________
L AUREN A NN D EGNAN , Fish & Richardson P.C., Wash-
ington, DC, argued for appellant. Also represented by
WALTER K ARL RENNER, ROSALYND U PTON; O LIVER
RICHARDS , San Diego, CA.
L UKE MC CAMMON, Finnegan, Henderson, Farabow,
Garrett & Dunner, LLP, Washington, DC, argued for cross-
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 2
appellants. Also represented by ERIKA ARNER; D ANIEL C.
T UCKER , MICHAEL V INCENT Y OUNG, SR., Reston, VA.
______________________
Before M OORE, Chief Judge, L OURIE and STARK, Circuit
Judges.
L OURIE, Circuit Judge.
iRobot Corporation (“iRobot”) appeals from the final
written decision of the U.S. Patent and Trademark Office
Patent Trial and Appeal Board (“the Board”) holding that
claims 1−4, 6−8, 10, 12−15, 18−23, 25, and 26 of U.S. Patent
9,884,423 (“the ’423 patent”) are unpatentable as obvious
over the asserted prior art. SharkNinja Operating LLC v.
iRobot Corp., No. IPR2021-00544 (P.T.A.B. Nov. 14, 2022),
J.A. 1−62 (“Decision”). SharkNinja Operating LLC,
SharkNinja Management LLC, and SharkNinja Sales Co.
(collectively, “SharkNinja”) cross-appeal the decision that
claim 9 of the ’423 patent had not been shown to have been
obvious. For the following reasons, we affirm.
BACKGROUND
This appeal pertains to an inter partes review (“IPR”)
in which SharkNinja challenged claims 1−4, 6−10, 12−15,
18−23, 25, and 26 of the ’423 patent, which recite methods
of docking a robotic cleaning device at a base station to
charge. For example, claim 1 recites:
1. A method of docking a robotic cleaning device
with a base station that includes a plurality of sig-
nal emitters including a right signal emitter and a
left signal emitter, the method comprising:
directing the robotic cleaning device about a
room at a first velocity;
detecting, by a sensor mounted on the robotic
cleaning device, a right signal transmitted by
the right signal emitter of the base station and
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 3
a left signal transmitted by the left signal emit-
ter of the base station;
controlling forward movement of the robotic
cleaning device toward the base station at a
second velocity less than the first velocity while
orienting the robotic cleaning device in relation
to the right signal and the left signal;
detecting contact with charging terminals on
the base station;
stopping the forward movement of the robotic
cleaning device in response to detecting contact
with the charging terminals on the base sta-
tion; and
charging a battery of the robotic cleaning de-
vice.
’423 patent, col. 19 ll. 32−52 (emphases added).
SharkNinja raised five grounds of invalidity in its peti-
tion. Ground 1 challenged claims 1−4, 6−10, and 12 in view
of a U.S. Patent Application Publication (“Jeon”)1 and a
textbook on sensors for mobile robots (“Everett”).2 Ground
2 challenged the same claims over the same two references
in view of an additional U.S. Patent Application (“Abram-
son”)3. Grounds 3 and 4 challenged only claim 9 in view of
Jeon, Everett, and another textbook (“Jones”)4, with
1 U.S. Patent Application Publication 2004/0178767;
J.A. 780−90.
2 H. R. Everett, “Sensors for Mobile Robots: Theory
and Application,” ISBN 1-56881-048-2, 1995; J.A.
791−1243.
3 U.S. Patent Application Publication 2005/0010330;
J.A. 1350−78.
4 J. L. Jones, “Mobile Robots: Inspiration to Imple-
mentation,” ISBN 1-56881-097-0, 1998; J.A. 1379−1620.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 4
Ground 4 further adding Abramson to the list of asserted
references. Finally, Ground 5 challenged claims 13−15,
18−23, 25, and 26 in view of a U.S. Patent (“Kim”)5 and Ev-
erett. Each of the asserted references describes autono-
mous cleaning robots with charging base stations.
In its Final Written Decision, the Board found that
SharkNinja had established the unpatentability of all chal-
lenged claims, except claim 9. Both parties appealed.
We have jurisdiction under 28 U.S.C. § 1295(a)(4)(A)
and 35 U.S.C. § 141(c).
D ISCUSSION
We review the Board’s legal determinations de novo, In
re Elsner, 381 F.3d 1125, 1127 (Fed. Cir. 2004), and the
Board’s factual findings for substantial evidence, In re
Gartside, 203 F.3d 1305, 1316 (Fed. Cir. 2000). A finding
is supported by substantial evidence if a reasonable mind
might accept the evidence as adequate to support the find-
ing. Consol. Edison Co. v. NLRB, 305 U.S. 197, 229 (1938).
On appeal, iRobot contends that the Board erred in
concluding that Jeon and Abramson constituted prior art
under 35 U.S.C. § 102(e) after finding that iRobot failed to
sufficiently establish and corroborate a prior date of con-
ception. iRobot further contends that the Board erred in
reaching its obviousness determination in the context of
Ground 5, asserting that the Board impermissibly relied on
hindsight in finding a motivation to combine and in reach-
ing its conclusions as to iRobot’s proffered evidence of ob-
jective indicia of nonobviousness. On cross-appeal,
SharkNinja challenges the Board’s conclusion that it failed
to establish the unpatentability of claim 9 by a preponder-
ance of the evidence. We address each argument in turn.
5 U.S. Patent 5,440,216; J.A. 1636−66.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 5
I
iRobot first argues that the Board erred in evaluating
whether or not conception had been established prior to the
publication of two asserted references: Jeon, which was
filed on June 23, 2003, and Abramson, which was filed on
July 11, 2003. J.A. 780, Field (22); id. at 1350, Field (22).
In comparison, the application for the ’423 patent was filed
on April 19, 2017, with claims of priority back to January
21, 2004.6 J.A. 63−64, Fields (22) & (60).
To antedate an asserted reference, the patent owner
must establish “an earlier conception followed by a diligent
reduction to practice.” Purdue Pharma L.P. v. Boehringer
Ingelheim GMBH, 237 F.3d 1359, 1365 (Fed. Cir. 2001).
The burden for establishing prior invention falls squarely
on the patent owner. In re Magnum Oil Tools Int’l, Ltd.,
829 F.3d 1364, 1375−76 (Fed. Cir. 2016) (citing Dynamic
Drinkware, LLC v. Nat’l Graphics, Inc., 800 F.3d 1375,
1379 (Fed. Cir. 2015)).
In addition to providing evidence of conception that en-
compasses all limitations of the claimed invention, see
Singh v. Brake, 222 F.3d 1362, 1367 (Fed. Cir. 2000), a pa-
tent owner must provide independent corroborating evi-
dence. Apator Miitor s ApS v. Kamstrup A/S, 887 F.3d
1293, 1295 (Fed. Cir. 2018) (“It is well established . . . that
when a party seeks to prove conception through an inven-
tor’s testimony the party must proffer evidence, ‘in addition
to [the inventor’s] own statements and documents,’ corrob-
orating the inventor’s testimony.”) (quoting Mahurkar v.
C.R. Bard, Inc., 79 F.3d 1572, 1577 (Fed. Cir. 1996)). Such
corroborating evidence must exist “so that a sound
6 Because the effective filing date of the patent at is-
sue is before March 16, 2013, pre-AIA provisions apply. See
Leahy-Smith America Invents Act (“AIA”), Pub. L. No. 112-
29, § 3(n)(1), 125 Stat. 284 (2011).
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 6
determination of the credibility of the inventor’s story may
be reached.” NFC Tech., LLC v. Matal, 871 F.3d 1367,
1372 (Fed. Cir. 2017) (internal quotation marks omitted);
see also Berges v. Gottstein, 618 F.2d 771, 776 (CCPA 1980)
(“[E]ach corroboration case must be decided on its own
facts with a view to deciding whether the evidence as a
whole is persuasive.”).
The Board held that iRobot failed to establish that the
claimed invention was conceived before Jeon and Abram-
son. Decision at 14–21. In particular, the Board held that
iRobot’s proffered evidence:
d[id] not specifically show conception of detecting
contact with the charging terminals or stopping
movement of the robot in response to detecting con-
tact with the charging terminals. Moreover, this
purported evidence of prior conception fails be-
cause it is not corroborated by independent evi-
dence of conception of the relevant elements of the
claimed invention.
Decision at 20; see also id. at 19, 19 n.17 (considering code
files and “not find[ing] corroboration”); id. at 20 n.18, (ad-
dressing a former employee’s testimony and holding that it
“does not corroborate that the inventors conceived of de-
tecting contact with the charging terminals or stopping
movement of the robot in response to detecting contact with
the charging terminals prior to June 23, 2003).
The Board thus concluded that Jeon and Abramson are
prior art to the ’423 patent under pre-AIA 35 U.S.C.
§ 102(e), which, in pertinent part, provides that a “person
shall be entitled to a patent unless . . . the invention was
described in . . . an application for patent, published under
section 122(b), by another filed in the United States before
the invention by the applicant for patent.”
Conception is a question of law predicated on subsidi-
ary factual findings, one of which is the sufficiency of
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 7
corroboration. REG Synthetic Fuels, LLC v. Neste Oil Oyj,
841 F.3d 954, 958 (Fed. Cir. 2016). As indicated above, the
Board found a lack of proof of conception before Jeon and
Abramson. iRobot argues that the Board erred in reaching
that conclusion, but we need not address conception be-
cause the issue regarding the applicability of Jeon and
Abramson can be resolved by looking only to corroboration.
iRobot contends that we should review the Board’s
analysis on corroboration de novo, asserting that the Board
legally erred by requiring that the evidence “recite ‘magic
words’ corresponding to the words used in the claims.” Ap-
pellant’s Br. at 3. We disagree with that characterization.
The Board did not require that the proffered evidence re-
cite claim language. Rather, it correctly required the inde-
pendent evidence to corroborate that the claimed
invention, which included a method comprising the robotic
cleaning device making contact with charging terminals on
the base station and subsequently stopping movement
upon detecting contact with said charging terminals, had
been conceived prior to June 23, 2003. The Board con-
cluded that it did not, and that finding was supported by
substantial evidence.
In particular, iRobot attempted to rely upon a “user.tl”
source code file to corroborate that the inventors had con-
ceived of a robotic cleaning device that could detect contact
with the charging terminals, and subsequently stop move-
ment in response to that detection, as claimed. The source
code file provides a “charger-available?” macro, but no ad-
ditional detail to corroborate that electrical contacts were
being made or detected. See J.A. 6735. Similarly, although
the source code includes a subsequent “stop-all” macro, no
additional detail is provided to establish if that command
pertains specifically to stopping movement of the robotic
cleaning device in response to detecting contact with charg-
ing terminals. See id. Expert testimony submitted by iRo-
bot did not further clarify the matter, as it stated only that
the “charger-available?” condition “outputs an indicator” if
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 8
the robotic cleaning device is “electrically connected” to the
charger. J.A. 6648.
iRobot also cited a Design Strategies document as cor-
roborating conception of having the robot detect and re-
spond to contact with charging terminals, but that
document describes only how a “logic input” indicates
“when the external charger is available (that is, when good
contact has been made).” J.A. 6765. It further indicates
that docking at the charger “depends on the mechanical
configuration of the charger,” which suggests that the De-
sign Strategies document applied to more than one charg-
ing configuration. Id. And, as the Board correctly noted,
the document’s reference to making “good contact” is insuf-
ficient to corroborate conception in view of the ’423 patent’s
disclosure of detecting contact via depression of the robot’s
bumper, rather than by an electrical contact. Decision at
18–19; ’423 patent, col. 15 ll. 13–24.
To be clear, the proffered evidence need not recite the
specific claim language to corroborate conception, but it
must nevertheless be specific enough to evidence concep-
tion of the claimed electrical contacts, rather than contact
via bumper depression. As the Board correctly identified,
such language is absent from that document. See Decision
at 18 (“[T]here is no specific reference to the charging ter-
minals of the base station. . . . And there is no reference in
[the Design Strategies document] to stopping the robot in
response to detecting contact with the charging terminals
of the base station or otherwise.”). That the documents
could also theoretically have been interpreted to describe
electrical contacts is insufficient to overturn the Board’s
factual finding on corroboration. Velander v. Garner,
348 F.3d 1359, 1378–79 (Fed. Cir. 2003)) (“If the evidence
will support several reasonable but contradictory conclu-
sions, we will not find the Board’s decision unsupported by
substantial evidence simply because the Board chose one
conclusion over another plausible alternative.”).
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 9
iRobot also generally cited a former employee’s decla-
ration as independent evidence corroborating conception.
J.A. 294 (Patent Owner Response, broadly asserting that a
declaration by a former employee “corroborates the testi-
mony of the inventors’ conception”), 7505–12 (former em-
ployee declaration). But the Board found that that also
failed to sufficiently corroborate conception. Decision at 17
n.16. In particular, as explained by the Board:
In addition to the evidence cited by Patent Owner
in the section of the Response relating to concep-
tion (see Resp. 12), Patent Owner contends that the
Declaration of Scott Miller (Ex. 2067), a former em-
ployee, “corroborates the testimony of the inven-
tor’s conception” (see Resp. 3). Patent Owner does
not expound on or explain this contention. None-
theless, we considered the testimony of Mr. Miller
in Exhibit 2067. Exhibit 2067 does not corroborate
that the inventors conceived of detecting contact
with the charging terminals or stopping movement
of the robot in response to detecting contact with
the charging terminals prior to June 23, 2003.
Id. at 20 n.18.
iRobot asserts that “Miller’s unrebutted, disinterested
testimony” corroborates “‘detecting’ and monitoring electri-
cal contact between the robot and the base station—exactly
as claimed.” Appellant’s Br. at 47. But, as the Board cor-
rectly noted, that testimony does not describe the claimed
charging terminals. It therefore cannot, on its own, suffi-
ciently corroborate their alleged conception date. The for-
mer employee’s testimony further cites a Technical
Specifications document as purported corroborating evi-
dence of conception, but, as the Board correctly found, that
document similarly contains no reference to the charging
terminals of the base station, detecting the charging termi-
nals, or stopping the robot in response to detecting contact
with the charging terminals of the base station. Decision at
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 10
17 n.16. It therefore also fails to corroborate earlier con-
ception of those claim elements.
The remaining cited paragraphs of iRobot’s technical
expert’s declaration are insufficient to fill the gaps in iRo-
bot’s corroborative evidence. Indeed, other than reciting
the relevant claim elements and quoting the user.tl source
code file and Design Strategies document, the expert dec-
laration offers only two conclusory sentences: that “[t]he
iRobot documents and source code files provide these ele-
ments,” J.A. 6648, ¶ 55, and that the Design Strategies
document “indicates that the Roomba would stop its for-
ward movement to dock at the charger when it detects con-
tact with the charging terminals on the base station,” J.A.
6648, ¶ 57. Such testimony, without more, is only conclu-
sory with inadequate supporting evidence. It was appro-
priate, therefore, for the Board to accord it little or no
weight. 37 C.F.R. § 42.65(a) (“Expert testimony that does
not disclose the underlying facts or data on which the opin-
ion is based is entitled to little or no weight.”). In particu-
lar, the expert declaration never provided a supported
explanation for what a person of ordinary skill in the art
would have understood the “charger-available?” macro to
mean.
Instead, the record provides evidence that (1) the in-
ventors had not yet coded a charger that utilized the
claimed charging contacts, J.A. 4919−20 at 122:22–123:5;
(2) the inventors could not testify to the meaning of the
“charger-available?” function without additional support-
ing evidence to provide “context,” J.A. 5135–36 at 115:3–
116:3; and (3) as admitted by iRobot’s counsel at oral argu-
ment before the Board, such context was never provided to
iRobot’s technical expert or to SharkNinja, J.A. 481 (“I’m
not sure that that code existed or where it was located, or
you know, where it was from. But it wasn’t – we didn’t
have detailed code from 19 years ago on that one specific
feature.”).
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 11
In view of the above, we find that the Board’s determi-
nation that the proffered evidence is insufficient to corrob-
orate earlier conception was supported by substantial
evidence. We therefore affirm the Board’s ultimate deter-
mination that iRobot did not successfully swear behind
Jeon and Abramson and that therefore those references
were available as prior art to assert against the ’423 patent.
II
iRobot next asserts that the Board legally erred in find-
ing a motivation to combine two prior art references as-
serted in SharkNinja’s fifth asserted ground of
obviousness, as well as in evaluating iRobot’s proffered ev-
idence of objective indicia of nonobviousness. We address
each argument in turn.
A
iRobot first argues that the Board erred in finding a
motivation to combine Kim and Everett when evaluating
the obviousness of claims 13–15, 18–23, 25, and 26. Ac-
cording to iRobot, the Board’s motivation analysis was er-
roneously cursory, improperly concluding that a person of
ordinary skill in the art would have been motivated to com-
bine the two references simply because of their similarities.
iRobot further contends that the Board erred by limiting
its own analysis on the matter to a single sentence declar-
ing that “Petitioner’s reasoning is sound.” See Decision at
56. We disagree.
The Board first identified that “motivation to combine
is the only disputed issue as to the challenge” to claims
13−15, 18−23, 25, and 26 in view of Kim and Everett, and
thus it elected to “take up that issue first.” Id. at 54. The
Board next identified how Kim teaches each and every
claim limitation except one pertaining to a “second veloc-
ity,” which is taught by Everett. Id. at 55. The Board thus
only had to address whether or not a person of ordinary
skill in the art would have been motivated to combine
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 12
Everett’s teachings of a second velocity with Kim’s robotic
cleaning device. Its subsequent analysis considering and
weighing the arguments raised by SharkNinja and iRobot
on the matter spanned several pages. Id. at 55–57.
As explained by the Board, SharkNinja first proposed
that a skilled artisan would have had a motivation to com-
bine Kim and Everett given the similarities between the
two references’ teachings. Decision at 55. iRobot countered
that the devices taught in the asserted references “have
significant differences in size, weight, configuration, and
operation.” Id. The Board agreed with SharkNinja that
iRobot’s arguments were “not supported, speculative, and
incorrect,” as well as “a legally insufficient bodily incorpo-
ration argument.” Id. at 56 (citing Allied Erecting & Dis-
mantling Co. v. Genesis Attachments, LLC, 825 F.3d 1373,
1381 (Fed. Cir. 2016)).
The Board also considered SharkNinja’s argument that
a “skilled artisan would have been motivated to reduce
base station approach velocity as taught by Everett in
[]Kim’s robot to achieve a predictable, desired result (avoid-
ing collision and/or increased robot maneuverability for ac-
curate alignment with the base station),” finding that
rationale “sound.” Decision at 55–56.
The Board additionally assessed SharkNinja’s argu-
ment that a person of ordinary skill in the art would have
been motivated to combine Kim with Everett in view of the
magnet system that Kim disclosed for aligning the robotic
cleaning device on the base station. In particular, the
Board credited SharkNinja’s argument that such a mag-
net-based system would “not prevent misalignment of a ro-
bot, traveling at a higher velocity, with its charging
station.” Id. at 56. It then concluded that “the system dis-
closed in Kim would benefit from the robot approaching the
base station to recharge at a lesser velocity than its clean-
ing velocity.” Id. The Board’s analysis was thus not imper-
missibly cursory as iRobot contends.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 13
The Board also does not appear to have impermissibly
relied on hindsight in finding a motivation to combine. Ra-
ther, it simply accepted SharkNinja’s argument that a per-
son of ordinary skill in the art would have recognized that
reducing velocity upon an attempt to dock, as taught by
Everett, would beneficially reduce the momentum of Kim’s
robot to promote better alignment at the charging base sta-
tion. The Final Written Decision thus properly “reflects
that the Board considered [the patent owner’s] arguments
regarding motivation to combine, weighed them against
the competing evidence and argument, and concluded that
despite [the patent owner’s] contentions, one of skill in the
art would have been motivated to combine” the asserted
prior art. Novartis AG v. Torrent Pharms. Ltd., 853 F.3d
1316, 1327 (Fed. Cir. 2017).
We thus see no error in the way in which the Board
addressed or weighed the evidence of record in assessing
motivation to combine and find its conclusions to be sup-
ported by substantial evidence. We therefore affirm the
Board’s determination that SharkNinja established by a
preponderance of the evidence that a person would have
had a motivation to combine Kim with Everett, rendering
claims 13–15, 18–23, 25, and 26 obvious.
B
iRobot next argues that the Board’s determinations re-
garding objective indicia of nonobviousness were also in-
fected by hindsight and contrary to this court’s precedent.
We disagree. Although the Board was quite particular in
its analysis, it correctly required sufficiently detailed evi-
dence to support a nexus between evidence of nonobvious-
ness and the claims. Indeed, as the Board noted, much of
iRobot’s evidence of nonobviousness referred to a broad ar-
ray of Roomba devices and was not limited to ones that are
specifically pertinent to the claims at issue. Decision at 27–
34.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 14
A patent owner is entitled to a presumption of nexus
when it shows that the asserted objective evidence is tied
to a specific product that “embodies the claimed features,
and is coextensive with them.” Brown & Williamson To-
bacco Corp. v. Philip Morris, Inc., 229 F.3d 1120, 1130
(Fed. Cir. 2000). The “existence of and weight assigned to
any objective indicia of nonobviousness” is an “underlying
factual question[].” Adapt Pharma Operations Ltd. v. Teva
Pharms. USA, Inc., 25 F.4th 1354, 1364 (Fed. Cir. 2022);
see also Bosch Auto. Serv. Sols., LLC v. Matal, 878 F.3d
1027, 1036–38 (Fed. Cir. 2017) (“[W]hether the requisite
nexus exists is a question of fact.” (citation omitted)).
We agree with the Board that iRobot failed to provide
sufficient support that any of its products embodied any of
the challenged claims. See Decision at 27 (“Patent Owner
has not shown any commercial product is within the scope
of the challenged claims”). Indeed, iRobot asserts that it
offered evidence relating to its Roomba 900 series which
was alleged to “embody at least claims 13 and 21 of the ’423
patent,” Appellant’s Br. at 65, but admits that it did not
submit evidence establishing that the Roomba 900 series
products approach the docking station at a “second velocity
less than the first velocity before completing a cleaning
task in the room and in response to detecting a need to
charge the energy storage unit” as required by the claims.
’423 patent, col. 20 ll. 47–50; see Appellant’s Br. at 66–67
(“iRobot had specifically pointed to the CES video as show-
ing the robot slowing down as it approached” the base sta-
tion, but “in the video, the return to the base station was
initiated by the demonstrator using a mobile phone appli-
cation,” rather than by detecting a need to charge.).
Moreover, iRobot never provided an analysis to estab-
lish coextensiveness, and therefore could not have estab-
lished a presumption of nexus for its products. Decision at
28 (“Patent Owner does not provide an analysis demon-
strating that its evidence or products are coextensive (or
nearly coextensive) with the challenged claims.”).
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 15
Nevertheless, a patent owner is further “afforded an op-
portunity to prove nexus by showing that the evidence of
secondary considerations is the ‘direct result of the unique
characteristics of the claimed invention.’” Fox Factory, Inc.
v. SRAM, LLC, 944 F.3d 1366, 1373–74 (Fed. Cir. 2019)
(quoting In re Huang, 100 F.3d 135, 140 (Fed. Cir. 1996)).
But iRobot failed to establish that the proffered evidence of
secondary considerations was the direct result of any
unique characteristics of the claims. Instead, as the Board
found, the evidence proffered by iRobot “is of broad scope
relating to Roomba and not shown to be related to the
claimed invention.” Decision at 33. iRobot did allege recog-
nition, praise, and copying in view of an “auto charge and
resume functionality,” see J.A. 349−53, but it rested its ar-
guments only on the patent’s independent claims, which do
not recite such a feature, and iRobot failed to argue that
any other subset of claims was separately patentable. See
J.A. 341−42; Decision at 33–34 (quoting SharkNinja’s anal-
ysis that “claim 1 recites no such functionality and claims
13 and 21 recite only auto-charging, not resuming”); see
also, e.g., Rambus Inc. v. Rea, 731 F.3d 1248, 1257 (Fed.
Cir. 2013) (holding that there is no nexus unless the evi-
dence presented is “reasonably commensurate with the
scope of the claims” (quoting In re Huai-Hung Kao,
639 F.3d 1057, 1068 (Fed. Cir. 2011))). Accordingly, we
find that the Board’s conclusion that iRobot did not estab-
lish a nexus between its products and the claims was sup-
ported by substantial evidence.
We therefore affirm the Board’s determination that
iRobot did not establish sufficient objective indicia of non-
obviousness to overcome SharkNinja’s prima facie case.
III
On cross-appeal, SharkNinja argues that the Board
erred in holding that it failed to establish the obviousness
of claim 9 by a preponderance of the evidence.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 16
SharkNinja challenged the patentability of claim 9 in
four of its five asserted grounds. In its first ground,
SharkNinja asserted obviousness in view of Jeon and Ev-
erett, but the Board held that that combination failed to
teach certain elements of claim 1—a determination that
SharkNinja did not challenge on appeal. In its second
ground, SharkNinja asserted Jeon and Everett in further
view of Abramson. Its third and fourth grounds (collec-
tively, the “Jones grounds”) repeated the challenges of
Grounds 1 and 2 further in view of the Jones reference. See
Decision at 52.
Claim 9 depends from claim 1 and recites that the
method further comprises “avoiding, by the robotic clean-
ing device, the right signal and the left signal while an en-
ergy level of the battery of the robotic cleaning device
remains above a predetermined energy level.” ’423 patent,
col. 20 ll. 20−24.
SharkNinja argues that the Board erred in considering
the second ground by incorrectly reading embodiments into
the claim, yielding a too-narrow construction for the term
“avoiding.” It further contends that the Board’s determi-
nations that the claims had not been shown to have been
obvious by the Jones grounds were unsupported by sub-
stantial evidence. We address each argument in turn.
A
SharkNinja’s first argument hinges on claim construc-
tion. Although the parties disputed what “avoiding” in the
context of claim 9 meant, neither argued for a formal con-
struction. Decision at 53. The Board held that “avoiding”
required “more than not attempting to detect the signals”
after consulting the ’423 patent specification, which con-
sistently describes “avoidance” features as involving the ro-
botic cleaning device actively keeping away from the base
station’s signals. Id. We review claim construction based
on the intrinsic record de novo. Teva Pharms. USA, Inc. v.
Sandoz, Inc., 574 U.S. 318, 331 (2015).
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 17
We begin by looking to the language of the claim itself.
Allergan Sales, LLC v. Sandoz, Inc., 935 F.3d 1370, 1374
(Fed. Cir. 2019). Claim 9 depends from claim 1 and recites
that the method comprises “avoiding, by the robotic clean-
ing device, the right signal and the left signal while an en-
ergy level of the battery of the robotic cleaning device
remains above a predetermined energy level.” ’423 patent,
col. 20 ll. 20−24. Some understanding of the meaning of
claim 9 can be gleaned from claim 1, which first introduces
said right and left signals.
Claim 1 describes two different types of interplay be-
tween the robotic cleaning device and those signals. The
claim first requires that the device detects the signals. ’423
patent, col. 19 ll. 38–41 (“detecting, by a sensor mounted on
the robotic cleaning device, a right signal transmitted by
the right signal emitter of the base station and a left signal
transmitted by the left signal emitter of the base station”).
Thereafter, claim 1 describes physical movement of the de-
vice in relation to the signals. Id. col. 19 ll. 42–46 (“control-
ling forward movement of the robotic cleaning device
toward the base station . . . while orienting the robotic
cleaning device in relation to the right signal and the left
signal”). Such orientating allows the device to dock onto
the base station such that the final step in the claimed
method, “charging a battery of the robotic cleaning device,”
can be achieved. Id. col. 19 l. 52. But ultimately, claim 1
does not provide much clarity as to whether avoidance of
those signals, as recited in claim 9, requires an active
movement component or if mere avoidance of detection suf-
fices.
Additional context for understanding the scope of claim
9 may be gleaned from claim 3, which also depends directly
from claim 1, and recites “seeking, by the robotic cleaning
device, the right signal and the left signal when the energy
level of the battery is less than a predetermined energy
level.” Id. col. 19 ll. 61–65 (emphasis added). Claim 3, with
its seeking behavior at a lower battery level, thus appears
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 18
as somewhat of a counterpart to claim 9, with its avoiding
behavior at a higher battery level. Claim 6, which depends
from claim 3, further recites “altering a movement charac-
teristic of the robotic cleaning device in seeking the right
signal and the left signal.” Id. col. 20 ll. 6–8 (emphasis
added). There is no claim 6 counterpart that depends from
claim 9, however. Thus, whether claim 9 requires some-
thing more than not detecting the signal, such as by, e.g.,
altering a movement characteristic in avoiding the right
and left signal requires us to consult the rest of the intrin-
sic record, focusing on the patent’s specification, as the par-
ties have not pointed to anything in the prosecution history
that could meaningfully impact our analysis. See Phillips
v. AWH Corp., 415 F.3d 1303, 1315 (Fed. Cir. 2005) (noting
that the specification is “highly relevant to the claim con-
struction analysis” and the “single best guide to the mean-
ing of a disputed term” (quoting Vitronics Corp. v.
Conceptronic, Inc., 90 F.3d 1576, 1582 (Fed. Cir. 1996))).
The specification clarifies the matter. For example, it
confirms that the “seek” behavior of claim 3 and the “avoid”
behavior of claim 9 are not perfectly parallel counterparts.
That is—the “seek” behavior is one that may be engaged
“passively” as well as “actively,” depending on the battery
level and state of operation of the robotic cleaning device.
See, e.g., ’423 patent, F IG. 7. The patent does not describe
a passive version of avoidance, however. Instead, as the
Board correctly noted, avoidance behaviors are consist-
ently described as active ones, requiring a movement com-
ponent. See Decision at 53 (citing ’423 patent, col. 2 ll. 52–
57 (describing that, “when the quantity of energy stored [in
the robot’s battery] exceeds the high energy level,” the ro-
bot performs a “task including movement of the robotic de-
vice away from the base station in response to reception, by
the signal detector, of a base station avoidance signal”), col.
3 l. 65–col. 4 l. 1 (describing how “the first signal emitter
transmits an avoidance signal, thereby restricting a move-
ment of the robotic device to directions away from the base
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 19
station, [while] the second signal emitter transmits a hom-
ing signal, thereby directing a movement of the robotic de-
vice to the base station”), col. 6 ll. 17–22 (describing how
“an avoidance signal” is generated “in a diffuse region near
the base station 10 to prevent generally the robot from
coming into inadvertent direct contact with the base sta-
tion 10 while performing a task, such as vacuuming”), col.
11 l. 62–col. 12 l. 21 (similar)).
SharkNinja protests that such an analysis impermissi-
bly reads embodiments into the claims while also ignoring
the plain claim language that recites that the robotic clean-
ing device avoid the right and left signals, rather than the
base station. That is not correct. The examples above
serve only to demonstrate that the patent consistently de-
scribes avoidance as an active behavior that alters the
movement of the robotic cleaning device. Although some of
those examples involve actively moving away from the base
station, the patent specification also describes actively
avoiding signals generated therefrom. For example, the
patent provides:
If an avoidance signal 60 is detected, the robot 40
chooses a turning direction 120. The robot 40 then
begins to turn in the chosen direction until the
avoidance signal 60 is no longer detected 130.
Once the avoidance signal 60 is no longer detected,
the robot 40 continues turning for an additional
amount 140 such as 20°, or the robot may turn ran-
domly between 0° and 135°.
’423 patent, col. 13 ll. 17–26 (emphasis added); see also id.
at F IG. 6A.
Such active avoidance behaviors are otherwise also in
accordance with the general tenor of the ’423 patent disclo-
sure. For example, starting in the abstract, the ’423 patent
describes “systems for emitting avoidance signals to pre-
vent inadvertent contact between the robot and the base
station.” ’423 patent, Abstract; see also id. col. 2 ll. 21–34
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 20
(describing prior art systems that did not actively prevent
inadvertent collisions between the robotic cleaning device
and the base station). Merely ignoring a homing signal, as
SharkNinja proposes claim 9 allows for, would not meet
that goal, as the robotic cleaning device may still otherwise
experience inadvertent contact with the base station. In-
deed, nowhere in the patent is the robotic cleaning device
described as merely avoiding detection of the signals with-
out additionally altering its movement. Rather, consist-
ently throughout the specification, the device first
purposefully detects the signals and then either actively
“avoid[s the] base,” where the signals are generated, see,
e.g., id. at F IG. 7, or otherwise actively alters its path first
so that it can subsequently avoid signal detection following
that act of relocation. Id. col. 13 ll. 17–26, F IG. 6A.
The specification thus confirms that a reader would un-
derstand “avoiding” to require something more than
merely not attempting to detect the signals. See Phillips,
415 F.3d at 1316 (“The construction that stays true to the
claim language and most naturally aligns with the patent’s
description of the invention will be, in the end, the correct
construction.”) (quoting Renishaw PLC v. Marposs Societa’
per Azioni, 158 F.3d 1243, 1250 (Fed. Cir. 1998)).
In appealing the Board’s determination that
SharkNinja failed to establish by a preponderance of the
evidence that Jeon, Everett, and Abramson render claim 9
obvious, SharkNinja contested only the Board’s construc-
tion of the term “avoiding.” Because we agree with the
Board’s construction, we affirm its ultimate conclusion that
claim 9 had not been shown to have been obvious.
B
SharkNinja finally asserts that, even if the Board’s
construction stands, its holdings that claim 9 was not
shown to have been obvious in view of the Jones grounds
were unsupported by substantial evidence.
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 21
In particular, SharkNinja seems to assert that the
Board erred by ignoring how the petition presented the
teachings of Jones in the context of its asserted obviousness
grounds. Notably, there is no dispute that Jones does not
teach the avoiding step recited in claim 9. Rather, Jones
teaches a different “avoid” feature in which the robotic
cleaning device avoids being distracted by IR signals that
have reflected off objects in the cleaning field. In its peti-
tion, SharkNinja asserted that a person of ordinary skill in
the art would have incorporated a variant of that feature
into the device taught by Jeon such that the modified de-
vice avoided signals emitted directly from the base station.
The Board aptly summarized SharkNinja’s argument,
quoting its assertion that such a combination would have
been capable of “achiev[ing] a predictable result” while fur-
ther “conserv[ing] energy, sav[ing] time, and avoid[ing] ac-
cidental collisions with the base station.” Decision at 54.
But the Board found that those arguments did not estab-
lish a prima facie case of obviousness because they were
“too general and conclusory.” Id. The Board further noted
that even if a person of ordinary skill in the art were to
incorporate Jones’s avoid feature into Jeon, the references
themselves still did not teach the element of avoiding sig-
nals emitted from the base station.
SharkNinja nevertheless appears to assert that, using
common sense and routine skill, one of ordinary skill in the
art would have had some non-negligible motivation to re-
configure Jones’s avoid feature to yield something that
could read on claim 9. The Board was correct to reject such
an argument. Although such “‘common sense’ [arguments]
can be invoked, even potentially to supply a limitation
missing from the prior art, [they] must still be supported
by evidence and a reasoned explanation.” Arendi S.A.R.L.
v. Apple Inc., 832 F.3d 1355, 1363 (Fed. Cir. 2016). We see
no error in the Board concluding that what SharkNinja
presented was insufficient to establish a prima facie case
of obviousness against claim 9 and find its factual findings
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IROBOT CORPORATION v. SHARKNINJA OPERATING LLC 22
on the matter to be supported by substantial evidence.
Accordingly, we affirm the Board’s determination that
SharkNinja failed to establish by a preponderance of the
evidence that the asserted combinations of Jeon, Everett,
Abramson, and Jones render claim 9 obvious.
CONCLUSION
We have considered the parties’ remaining arguments
and do not find them persuasive. For the foregoing rea-
sons, we affirm the Board’s determination in IPR2021-
00544 that claims 1−4, 6−8, 10, 12−15, 18−23, 25, and 26 of
U.S. Patent 9,884,423 are unpatentable, as well as its con-
clusion that SharkNinja did not establish the unpatenta-
bility of claim 9 by the requisite preponderance of the
evidence.
AFFIRMED
COSTS
No costs.
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