Case: 22-1398 Document: 81 Page: 1 Filed: 05/02/2024

NOTE: This disposition is nonprecedential.

United States Court of Appeals for the Federal Circuit ______________________ PACKET INTELLIGENCE LLC, Appellant v. JUNIPER NETWORKS, INC., PALO ALTO NETWORKS, INC., Cross-Appellants KATHERINE K. VIDAL, UNDER SECRETARY OF COMMERCE FOR INTELLECTUAL PROPERTY AND DIRECTOR OF THE UNITED STATES PATENT AND TRADEMARK OFFICE, Intervenor ______________________ 2022-1398, 2022-1400, 2022-1401, 2022-1403, 2022-1404, 2022-1405, 2022-1406 ______________________ Appeals from the United States Patent and Trademark Office, Patent Trial and Appeal Board in Nos. IPR2020- 00336, IPR2020-00337, IPR2020-00338, IPR2020-00339, IPR2020-00486. ______________________ Decided: May 2, 2024 ______________________ Case: 22-1398 Document: 81 Page: 2 Filed: 05/02/2024

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ROBERT ALLAN BULLWINKEL, Heim Payne & Chorush LLP, Houston, TX, argued for appellant. Also represented by CHRISTOPHER MICHAEL FIRST, MICHAEL F. HEIM.

R. WILLIAM SIGLER, Fisch Sigler, LLP, Washington, DC, argued for cross-appellant Juniper Networks, Inc. Also represented by ALAN M. FISCH, JEFFREY MATTHEW SALTMAN.

DOUGLAS HALLWARD-DRIEMEIER, Ropes & Gray LLP, Washington, DC, argued for cross-appellant Palo Alto Net- works, Inc. Also represented by JAMES RICHARD BATCHELDER, ANDREW T. RADSCH, East Palo Alto, CA.

OMAR FAROOQ AMIN, Office of the Solicitor, United States Patent and Trademark Office, Alexandria, VA, for intervenor. Also represented by PETER J. AYERS, ROBERT MCBRIDE, FARHEENA YASMEEN RASHEED. ______________________ Before LOURIE, HUGHES, and STARK, Circuit Judges.

STARK, Circuit Judge.

Packet Intelligence LLC (“Packet”) appeals the final written decisions of the Patent Trial and Appeal Board (“Board”) in inter partes review (“IPR”) proceedings finding certain claims of its U.S. Patent Nos. 6,665,725 (“’725 pa- tent”), 6,771,646 (“’646 patent”), 6,839,751 (“’751 patent”), and 6,954,789 (“’789 patent”) are unpatentable as obvious. 1

PACKET INTELLIGENCE LLC v. JUNIPER NETWORKS, INC. 3

Juniper Networks, Inc. and Palo Alto Networks, Inc., (col- lectively, “Juniper”) cross-appeal the Board’s final written decisions finding claim 3 of the ’646 patent and claim 34 of the ’789 patent are not unpatentable as obvious. We affirm in all respects. 2 Regarding Packet’s appeals, on de novo review we agree with the Board that the correct construction of “con- versational flow” in all challenged claims across all patents is a “sequence of packets that are exchanged in any direc- tion as a result of an activity.” 3 E.g., J.A. 22. The intrinsic

Juniper Networks, Inc. v. Packet Intel. LLC, IPR2020- 00337, 2021 Pat. App. LEXIS 5517, at *1-2 (P.T.A.B. Sept.

8, 2021). In IPR2020-00338, the Board found claims 1, 2, 5, 10, 14, 15, and 17 of the ’751 patent unpatentable. See Juniper Networks, Inc. v. Packet Intel. LLC, IPR2020- 00338, 2021 Pat. App. LEXIS 5520, at *1 (P.T.A.B. Sept. 8, 2021). In IPR2020-00339, the Board found claims 1, 2, 13- 17, 19, 20, 42, 44, 48, and 49 of the ’789 patent unpatenta- ble. See Juniper Networks, Inc. v. Packet Intel. LLC, IPR2020-00339, 2021 Pat. App. LEXIS 5525, at *1-2 (P.T.A.B. Sept. 8, 2021). In IPR2020-00486, the Board found claims 31 and 33 of the ’789 patent unpatentable and claim 34 of that same patent not unpatentable. See Juni- per Networks, Inc. v. Packet Intel. LLC, IPR2020-00486, 2021 Pat. App. LEXIS 5468, at *1 (P.T.A.B. Sept. 9, 2021).

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evidence on which Packet would have us base a narrower construction – including statements following “for in- stance” and “some” in the specification – is exemplary and not definitional. J.A. 1318 at 2:39-45. These statements do not justify limiting the scope of the “conversational flow” to specific network endpoints or a specific client or user.

Based on the correct construction, substantial evidence supports the Board’s finding that prior art U.S. Patent No. 6,412,000 (“Riddle”) discloses the claimed “conversational flow.” 4 Exchanging packets “in any direction,” as permit- ted under the Board’s construction, means that the chal- lenged claims encompass bidirectional packet flows as well as unidirectional flows (in any direction). It is undisputed that Riddle discloses unidirectional flows. Additionally, the Board found that Riddle discloses bidirectional packet flows as well, see, e.g., J.A. 39, and this finding is supported by substantial evidence, see, e.g., J.A. 1910 at 13:54-59 (Riddle disclosing “flow that is used to exchange commands and responses”).

Substantial evidence also supports the Board’s finding that Riddle discloses the claimed state-based analysis of “conversational flow.” During the IPR proceedings, Packet contended that “Riddle relates to classifying traffic based on an individual packet in the flow, rather than on a state of the flow (i.e., evaluation across multiple packets).” J.A.

17353 (internal emphasis omitted). Relying on expert tes- timony and prior art disclosures, the Board found, how- ever, that Riddle discloses classifying service aggregates based on a plurality of indicators across multiple packets.

See, e.g., J.A. 1909 at 12:53-57 (Riddle disclosing

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suppressing duplicate packets “in favor of keeping a count of the duplicates and a most recent time traffic with these identifying characteristics [that] was encountered”); J.A.

1554 ¶ 357 (Dr. Weissman testifying that “with flows in- volving FTP applications, Riddle teaches performing state operations to determine if the flow belongs to a service ag- gregate”). This is sufficient to allow us to affirm the Board’s findings.

Turning to Juniper’s cross-appeals, substantial evi- dence supports the Board’s finding that Juniper failed to show that prior art U.S. Patent No. 5,740,175 (“Wakeman”) discloses an associative cache. 5 Regardless, even assuming Wakeman discloses an associative cache, the Board’s find- ing that a person of ordinary skill in the art would not have been motivated to implement Wakeman’s content address- able memory (“CAM”) cache as an associative cache is sup- ported by substantial evidence. See, e.g., J.A. 17678-79 ¶¶ 89-90 (Ms. Quigley testifying “associative caches are not an obvious solution to all caching needs – they tend to be reserved for situations where the need for flexibility and performance exceeds the need for cost efficiency. . . . Wake- man’s focus on balancing cost and performance would not lead a POSITA to select an associative cache”).

Juniper did not present this contention to the Board, so we do not consider it. See Acoustic Tech., Inc. v. Itron Net- worked Sols., Inc., 949 F.3d 1360, 1364 (Fed. Cir. 2020).

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We have considered the parties’ remaining arguments and find them unpersuasive. 6 Thus, for the foregoing rea- sons, we affirm the Board’s final written decisions.

AFFIRMED COSTS No costs.

We have rejected this argument in Arthrex, Inc. v. Smith & Nephew, Inc., 35 F.4th 1328, 1335 (Fed. Cir. 2022), and must do so again here.