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Bit Swap: Motivation to Modify Prior Art Needn’t Be Inventor’s Motivation

by | Jan 16, 2025 |

Addressing the issue of obviousness, the US Court of Appeals for the Federal Circuit reversed a Patent Trial & Appeal Board decision, finding that the challenged patent claims were obvious because a person of ordinary skill in the art (POSITA) would have been motivated to switch two specific information bits in a 20-bit codeword to improve performance. Honeywell Int’l Inc. v. 3G Licensing, S.A., Case Nos. 23-1354; -1384; -1407 (Fed. Cir. Jan. 2, 2025) (Dyk, Chen, JJ.) (Stoll, J., dissenting).

3G Licensing owns a patent concerning a coding method for transmitting a channel quality indicator (CQI) in mobile communication systems. The CQI, a five-bit binary integer (0 to 30) is sent from user equipment, such as a cell phone, to a base station to indicate cellular connection quality. Base stations adjust data rates using adaptive modulation and coding, assigning higher rates to strong signals and lower rates to weaker ones. CQI accuracy is critical for maximizing data transmission efficiency and ensuring recovery of the original message despite transmission errors.

The challenged claims of the 3G patent relate to a CQI code designed to maximize protection of the most significant bit (MSB) to reduce the impact of transmission errors. The prior art disclosed a method and a basis sequence table that provided additional protection to the MSB, minimizing root-mean-square error. However, the claimed invention differed in that it required swapping the last two bits of the basis sequence table. The Board found that a skilled artisan would not have been motivated to make this modification to enhance MSB protection, nor would a skilled artisan have deemed it desirable. Honeywell appealed.

The Federal Circuit reversed, finding the claims obvious for four primary reasons. First, the Court determined that the Board incorrectly concluded that a POSITA would not have been motivated to swap the last two bits to improve MSB protection. The Court emphasized that the motivation to modify prior art does not need to align with the inventor’s motivation. As a result, the Board’s reasoning that minimizing root-mean-square error was not the patent’s primary purpose should not have been a primary consideration.

Second, the Federal Circuit found that prior art explicitly taught the importance of protecting the MSB through redundancy. A skilled artisan would have understood that swapping the two bits, as claimed, would add redundancy and enhance protection. Honeywell’s expert testimony further supported the conclusion that the prior art would have provided the requisite motivation to arrive at the claimed invention, and 3G’s expert did not dispute that the swap increased MSB protection.

Third, the Federal Circuit concluded that the Board improperly conflated obviousness with anticipation by requiring that the prior art disclose swapping the two bits. Anticipation requires the prior art to specifically disclose the claimed modification, but obviousness does not. The Court found that the Board erroneously treated the two standards as interchangeable.

Finally, the Federal Circuit found that the Board wrongly required that the claimed basis sequence table represent the preferred or most optimal combination. As the Court [...]

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Motivation MIA? Federal Circuit Sends IPR Back to the Drawing Board

by | Jan 9, 2025 |

The US Court of Appeals for the Federal Circuit vacated and remanded a Patent Trial & Appeal Board decision, finding that the Board erred by failing to explain its holding and reasoning regarding a motivation to combine prior art references. Palo Alto Networks, Inc. v. Centripetal Networks, LLC, Case No. 23-1636 (Fed. Cir. Dec. 16, 2024) (Stoll, Dyk, Stark, JJ.)

Centripetal Networks owns a patent directed to correlating packets in communications networks, introducing an innovative system designed to enhance network security. The patent focuses on packets (small data segments that collectively form larger communications) and their correlation across network boundaries.

Palo Alto Networks challenged the patent’s validity in an inter partes review (IPR) and argued its obviousness based on three prior art references. The first reference described a system using hashing techniques to identify packets traversing network address translation boundaries and teaching how to correlate packets across such boundaries to identify hosts transmitting or receiving them. The second reference detailed methods for detecting unauthorized traffic directed to unused IP addresses, notifying administrators of potential threats, and enabling automated responses, such as blocking or filtering malicious traffic. The reference taught notifying administrators how to manage packets involved in malicious activity after they crossed a network boundary.

Palo Alto argued that combining the packet correlation techniques of the first reference with the notification mechanisms of the second addressed a key claim limitation of the challenged patent. Palo Alto contended that transmitting an indication of a malicious host, as taught by the second reference, naturally followed from the correlation system described in the first. However, the Board found that Palo Alto failed to provide sufficient evidence or argument to show that a person of ordinary skill in the art (POSITA) would recognize the claimed responsiveness between the first reference’s packet correlation and the second reference’s notification mechanisms. Palo Alto appealed.

The Federal Circuit vacated and remanded the Board’s decision, finding that the Board erred by failing to clearly articulate its rationale regarding the motivation to combine the prior art references and whether their combination satisfied the critical limitation of the challenged patent claim. The Court emphasized that the proper inquiry in an obviousness analysis is not whether each reference individually discloses all claim elements but whether their combination would have rendered the invention obvious to a POSITA.

Palo Alto maintained that the Board did not dispute the existence of a motivation to combine and improperly searched for a “bridge” solely within the two references. Centripetal countered that Palo Alto had not established a motivation or provided evidence of a necessary connection – or “bridge” – between the prior art and the claimed invention.

The Federal Circuit determined that the Board’s decision lacked a definitive finding on whether a POSITA would have been motivated to combine the first reference’s correlation techniques with the second reference’s notification step. The Court noted that Palo Alto presented logical and evidentiary support as to why such a combination would make sense, arguing that without a notification step, the [...]

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Chromatographic Clash: When Is a Lead Compound Analysis Even Necessary?

by | Dec 12, 2024 |

The US Court of Appeals for the Federal Circuit affirmed the Patent Trial & Appeal Board’s determination that 79 challenged composition claims across three related patents were unpatentable but reversed the Board’s determination that four challenged process claims were not unpatentable. Cytiva Bioprocess R&D v. JSR Corp., et al., Case Nos. 23-2074; -2075; -2191; -2192; -2193; -2194; -2239; -2252; -2253; -2255 (Fed. Cir. Dec. 4, 2024) (Prost, Taranto, Hughes, JJ.)

The patents in question pertain to chromatography matrices used in affinity chromatography for isolating antibodies. Their primary focus was on the G29A mutation in SPA IgG binding domains, which enhances stability in alkaline environments. The Board upheld the patentability of the process claims while invalidating the composition claims. Cytiva appealed, arguing that the Board erred in its lead compound analysis. JSR cross-appealed on the Board’s finding that the challenged process claim were not unpatentable.

The Federal Circuit disagreed with Cytiva’s argument that a lead compound analysis was necessary. A lead compound analysis is an obviousness framework that involves a two-part inquiry: whether a skilled person in the art would have selected the compound as a starting point for research, and whether the prior art would have motivated the skilled person to modify the compound into the claimed invention. The Federal Circuit noted that lead compound analyses are not always required in chemical patent cases where the prior art references expressly suggest the proposed modification, which was the case here. The Court also explained that even though a lead compound analysis was used here, in this case the claimed compounds could all be lead compounds, and the prior art expressly suggested the G29A modification of the claimed compound.

The Federal Circuit also addressed whether a claim limitation that merely recites an inherent property of an otherwise obvious combination requires additional analysis to demonstrate that a person of ordinary skill in the art would have a reasonable expectation of success. The Court found that additional analysis was unnecessary because “the sole disputed limitation was an inherent property of the claimed composition already determined to be obvious.” The Court found that the Fab binding property of the chromatography matrices was inherent and thus did not require a separate reasonable expectation of success analysis.

As for the process claims that the Board found not unpatentable, the Federal Circuit determined that the composition and process claims were “nearly identical and contain[ed] no substantive distinction relevant to th[e] appeal.” Therefore, the Court held that the Board erred in separating the composition and process claims and found “no basis for treating the claims differently.” The Federal Circuit reversed the Board’s “not unpatentable” determination on those claims and held all challenged patent claims obvious and therefore unpatentable.



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Plausible Alternative Understanding of Prior Art? So What?

by | Dec 12, 2024 |

Affirming the Patent Trial & Appeal Board’s final determination that three claims were invalid for obviousness, the US Court of Appeals for the Federal Circuit ruled that a “plausible alternative understanding” of the prior art did not compel a reversal under the substantial evidence review standard. Koninklijke KPN N.V. v. Vidal, Case No. 19-2447 (Fed. Cir. Dec. 2, 2024) (Prost, Reyna, Chen, JJ.)

Three computer networking companies filed a petition for inter partes review (IPR) to challenge the patentability of claims of a patent for regulating access to a telecommunications network owned by Koninklijke. The challenged claims included limitations concerning devices, identified by a controller with a unique identifier, that requested access to a network. The controller allowed each device network access based on a “grant access time interval.” The petitioners argued that the challenged claims were unpatentable as obvious in view of three prior art references: Obhan, Shatzkamer, and Budka.

After considering the parties’ argument over what was disclosed by the references, the Board found that Obhan disclosed an admission control system for a wireless network that included assigning devices a “good till time.” The Board found that Shatzkamer disclosed managing a wireless network using a system to identify specific devices, add those devices to a “blacklist,” and deny network access to the blacklisted devices. The Board determined that the combination of Obhan, Shatzkamer, and Budka taught the limitations of the challenged claims. Koninklijke appealed.

Koninklijke argued that the Board erred in its determination that the prior art references taught certain claim limitations and provided motivation to combine the references.

Koninklijke first argued that substantial evidence did not support the Board’s finding that Obhan disclosed the access request limitations of the challenged claims. Koninklijke also argued that Obhan did not teach consulting a “good till time” to determine whether to allow a device to access the network. The Federal Circuit disagreed, finding that Koninklijke’s argument merely presented “a plausible alternative understanding of Obhan.” The Court explained that under the substantial evidence standard of review, this was not enough to conclude that the Board’s decision was unsupported by substantial evidence. The Court declined to reweigh the evidence or make factual findings of its own.

Second, Koninklijke argued that the Board’s determination was not supported by substantial evidence because the Board misread and misstated one of the challenged claims. An exemplary claim of the challenged patents recited “an access operation to deny access for the terminal if the access request is received within the time period,” whereas another recited “denying the terminal access to the telecommunications network responsive to the access request being received within the time period defined by the accessed identification of at least one associated deny access time interval.” In its decision, the Board stated that second claim “requires only that the access request be denied if it is received within the time period during which access is denied.” Koninklijke faulted the Board for using the term “if” instead of “responsive to.”

The Federal Circuit did not find [...]

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No Need to Call for Backup at the PTAB (Sometimes)

by | Oct 24, 2024 |

The US Patent & Trademark Office (PTO) published a final rule entitled, Expanding Opportunities to Appear Before the Patent Trial & Appeal Board; 89 Fed. Reg. 82172 (Oct. 10, 2024).

The new rule, set to take effect on November 12, 2024, will apply to America Invents Act (AIA) proceedings, which, until now, have required that a party designate lead counsel and backup counsel. Lead counsel was required to be a registered practitioner, and non-registered practitioners could be backup counsel upon a showing of good cause.

The PTO filed a notice of proposed rulemaking on February 21, 2024, in which it proposed amending the regulations to allow the Board to permit a party to proceed without separate backup counsel as long as lead counsel is a registered practitioner. The PTO also proposed to allow a non-registered practitioner admitted pro hac vice to serve as either lead or backup counsel for a party as long as a registered practitioner was also counsel of record for that party, and to allow a non-registered practitioner who was previously recognized pro hac vice in an AIA proceeding to be considered a Board-recognized practitioner and eligible for automatic pro hac vice admission in subsequent proceedings via a simplified and expedited process.

Citing the benefits of flexibility where good cause is shown while ensuring parties are well represented, the PTO has now issued a final rule that will allow parties to proceed without backup counsel. The PTO noted that a party may demonstrate good cause, for example, by demonstrating lack of financial resources to retain both lead and backup counsel. However, the Board will question any claim of lack of financial resources where a party has also elected to pursue litigation involving the challenged patents in other forums. As a result, this rule is more likely to benefit patentees than patent challengers. The PTO also explained that the good cause analysis will center on the party, not on the counsel’s preferences. For example, the PTO is unlikely to find good cause where the lead counsel is a solo practitioner who prefers to work alone.

The PTO also issued a final rule simplifying the process for attorneys who were previously admitted to practice before the Board pro hac vice to gain admission for subsequent matters and to do so without a fee. Any attorney seeking subsequent pro hac vice admission must file a declaration or affidavit stating that all the requirements set out by the Board are met. Opposing counsel also has the opportunity to object.

Finally, the PTO rejected an amendment that would allow non-registered attorneys to serve as lead counsel.



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Unified Front: No Forfeiture by Failing to Raise Argument in Request for Rehearing

by | Aug 8, 2024 |

Addressing forfeiture of issues on appeal and sufficiency of the asserted prior art, the US Court of Appeals for the Federal Circuit upheld a Patent Trial & Appeal Board obviousness finding, explaining that a party does not waive arguments on appeal by failing to include them in a request for rehearing. Voice Tech Corp. v. Unified Patents, LLC, Case No. 22-2163 (Fed. Cir. Aug. 1, 2024) (Lourie, Chen, Cunningham, JJ.)

Unified Patents petitioned for inter partes review (IPR) of a Voice Tech patent that purported to improve upon the prior art by allowing a single mobile device to access and control various native applications and functions on a computer. Unified alleged that the challenged claims were unpatentable as obvious over three prior art references. The Board agreed and found that all of the challenged claims were unpatentable. Voice Tech appealed.

Voice Tech argued that Unified’s petition failed to identify any disclosure in the prior art that taught the “mobile device interface” claim limitation in the challenged claims because Unified’s claim analysis failed to expressly mention a “mobile device interface.” The Board dismissed this argument, finding that Unified properly mapped its analysis of other patent claims to the “mobile device interface” claim recitation and presented a sufficient argument regarding obviousness. The Federal Circuit agreed that one of the prior art references taught a “mobile device interface.” The Court found that the Board did not rely on a new theory not found in the IPR petition, but instead had mapped the “mobile device interface” limitations to the prior art because the petition itself raised the theory.

Voice Tech also argued that the Board had failed to properly interpret certain claim terms. Unified countered that Voice Tech forfeited the claim construction arguments because they were not included in Voice Tech’s request for rehearing to the Board. The Federal Circuit disagreed, finding that a party’s choice to not re-raise an argument in a request for rehearing will not, by itself, forfeit the argument for review on appeal. The Court found that since Voice Tech had raised the claim construction arguments to the Board in its patent owner’s response, it had not forfeited those arguments on appeal.

The Federal Circuit also addressed Unified’s argument that Voice Tech’s proposed claim constructions would not change the outcome of the patentability analysis given the Board’s findings that the prior art disclosed the claim terms. The Court agreed with Unified, finding that it only needed to construe claim terms as necessary to resolve the controversy. The Court found that because Voice Tech’s responsive arguments were conclusory and failed to address how Voice Tech would be prejudiced by the Board’s adopted claim construction, the Federal Circuit did not need to consider Voice Tech’s claim construction arguments.

Finally, the Federal Circuit addressed Voice Tech’s arguments that the Board erred in finding that the prior art taught certain claim limitations and that Unified’s obviousness analysis was based on hindsight bias. The Court upheld the Board’s obviousness determinations as to all challenged claims, [...]

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Private Sale Means Public Fail

by | Aug 8, 2024 | ,

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board decision that a private sale of a product embodying the claimed invention did not qualify as a “public disclosure” under 35 U.S.C. § 102(b)(2)(B). Sanho Corp. v. Kaijet Technology Int’l Ltd, Inc., Case No. 23-1336 (Fed. Cir. July 31, 2024) (Dyk, Clevenger, Stoll, JJ.)

Sanho owns a patent directed to a port extension apparatus designed to enhance connectivity of end-user devices (such as laptops) with other devices (such as printers). Kaijet petitioned for inter partes review (IPR) challenging certain claims of Sanho’s patent, arguing that the claims were obvious based on a prior art reference. The Board found that the patent claims were invalid because of the prior art reference’s earlier effective filing date. Sanho argued that a prior sale of its HyperDrive device by the inventor of the patent should disqualify the reference as prior art. However, the Board determined that Sanho failed to demonstrate a public disclosure of the HyperDrive sale before the prior art reference’s effective filing date. Thus, the patent was invalidated. Sanho appealed.

The Federal Circuit affirmed, explaining that the America Invents Act (AIA) redefined prior art, shifting from a first-to-invent to a first-inventor-to-file system. Under the AIA, prior art includes patents and applications filed before the patent’s effective filing date subject to exceptions for public disclosures by the inventor. Sanho argued that the HyperDrive sale fell into this exception.

The Federal Circuit dismissed Sanho’s argument that the phrase “publicly disclosed” in § 102(b)(2)(B) should encompass all types of disclosures described in § 102(a)(1), including private sales. The crux of the issue was whether placing an invention “on sale” was tantamount to a “public disclosure” under § 102(b)(2)(B). The statute states that a disclosure is not prior art if the subject matter was publicly disclosed by the inventor before the effective filing date of the prior art. Sanho argued that “publicly disclosed” includes any disclosure, even private sales. The Court disagreed, explaining that the statute’s use of “publicly” implies a narrower scope than just “disclosed.” The Court noted that the purpose of this exception is to protect inventors who make their inventions available to the public before another’s patent filing.

The Federal Circuit also relied on legislative history in support of the conclusion that “public disclosure” in § 102(b)(2)(B) means the invention must be made available to the public. Sanho argued that as long as there are no confidentiality requirements, all disclosures, even private sales, should constitute public disclosures. Again, the Court rejected that argument, noting that the statute differentiates between “publicly disclosed” and general “disclosures,” implying different meanings.

The Federal Circuit determined that § 102(b)(2)(B) protects inventors who publicly disclose their inventions from subsequent disclosures by others, ensuring that prior public disclosure by the inventor prevents a third party’s disclosure from becoming prior art. This provision aims to encourage inventors to share their innovations with the public.

Practice Note: For a disclosure to qualify as “public” under the [...]

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PTAB MTA Pilot Program to the Rescue

by | Aug 1, 2024 |

On review of a final written decision from the Patent Trial & Appeal Board in an inter partes review (IPR), the US Court of Appeals for the Federal Circuit found that all challenged claims were obvious but left open the possibility of the patent owner amending the claims under the Motion to Amend (MTA) Pilot Program. ZyXEL Communications Corp. v. UNM Rainforest Innovations, Case Nos. 22-2220; -2250 (Fed. Cir. July 22, 2024) (Dyk, Prost, Stark, JJ.)

ZyXEL Communications petitioned for IPR challenging claims 1 – 4, 6, 7 and 8 of a patent owned by UNM Rainforest Innovation (UNMRI). The patent relates to methods for constructing frame structures in communication systems using orthogonal frequency-division multiple access (OFDMA) technologies. The patent describes a method for constructing a frame structure with two sections, each of which is configured for a different communication system, where the second communication system is used to support high mobility users (i.e., faster moving users).

Before the Board, ZyXEL argued that claims 1 – 4, 6 and 7 were unpatentable in light of two prior art references (Talukdar and Li), and that claim 8 was unpatentable in light of Talukdar and another prior art reference (Nystrom). During the Board proceedings, UNMRI filed a contingent motion to amend if any of the challenged claims were found to be unpatentable. As part of its motion, UNMRI requested preliminary guidance from the Board pursuant to the Board’s MTA Pilot Program. In its opposition to UNMRI’s motion to amend, ZyXEL argued that UNMRI’s amended claims lacked written description support, and in its preliminary guidance, the Board agreed. UNMRI attempted to file a revised motion to amend, but the Board rejected the revised motion and instead permitted UNMRI to file a reply in support of its original motion. It also allowed ZyXEL to file a sur-reply. The Board determined that claims 1 – 4, 6 and 7 were unpatentable, but that claim 8 was not. The Board also granted UNMRI’s motion to amend and determined that the new claims were nonobvious over the prior art of record. Both sides appealed.

With respect to the Board’s decision on the obviousness of claims 1 – 4, 6 and 7, the Federal Circuit found that substantial evidence supported the ruling. UNMRI’s primary argument was that a person of skill in the art (POSA) would not have been motivated to combine Talukdar and Li, but the Court credited the Board’s reliance on ZyXEL’s expert, who demonstrated sufficient motivation to combine the two references.

The Federal Circuit reversed the Board’s finding that claim 8 had not been shown to be obvious, however. The Court noted that while the Nystrom reference may not explicitly state the benefit of the missing limitations, “a prior art reference does not need to explicitly articulate or express why its teachings are beneficial so long as its teachings are beneficial and a POSA would recognize that their application was beneficial.”

Regarding UNMRI’s motion to amend, ZyXEL argued that the Board erred in granting the [...]

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From Oops to Encore: The Board’s Premature Adverse Judgment

by | Jul 25, 2024 |

The Director of the US Patent & Trademark Office (PTO) overturned the Patent Trial & Appeal Board’s premature adverse judgment against a patent owner and remanded an inter partes review (IPR) proceeding based on the fact that the patent owner had initially instructed its counsel to cease work on the IPR while seeking new representation for related district court litigation, which contributed to the procedural delays. Shenzhen Xinzexing E-commerce Co., Ltd. v. Shenzhen Carku Technology Co., Ltd., IPR2024-00222 (PTO-Ofc. of Dir. July 10, 2024) (Vidal, PTO Dir.)

Shenzhen Xinzexing E-commerce Co. filed a petition for an IPR to challenge certain claims of a patent owned by Shenzhen Carku Technology Co. (Patent Owner). The petition and associated documents for the IPR were properly served on the Patent Owner at the address of record. The Board issued a notice on November 29, 2023, allowing the Patent Owner three months to file a preliminary response and requiring mandatory notice information to be submitted within 21 days. The Patent Owner did not comply with either obligation.

Following the Patent Owner’s failure to submit the required notices and response, the Board issued a sua sponte adverse judgment on May 21, 2024, interpreting the lack of response as abandonment of the IPR contest. However, on July 8, 2024, the Patent Owner filed the necessary notices and appointed new counsel, indicating that the previous counsel had been instructed to withdraw from the case and that new representation was being arranged.

The Director sua sponte overturned the Board’s adverse judgment, finding that it was premature. The Board’s communications did not clearly indicate that noncompliance with the notice requirements would result in adverse judgment. Given that the Patent Owner had shown efforts to rectify the situation by appointing new counsel and filing the required documents, the director vacated the adverse judgment and remanded the case for the Board to determine whether the petition showed a reasonable likelihood that any of the challenged patent claims were unpatentable.

Practice Note: This decision highlights the necessity of adhering to procedural deadlines and ensuring that consequences for noncompliance are clearly communicated. The Board’s failure to provide explicit notice of abandonment of the contest contributed to the premature adverse judgment, reinforcing the importance of clear procedural guidance.



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PTO Finalizes Rules Promoting Independence in PTAB Decision-Making

by | Jun 20, 2024 |

The US Patent & Trademark Office (PTO) announced a final rule concerning pre-issuance internal circulation and review of decisions within the Patent Trial & Appeal Board. The new rules are designed to bolster the independence of administrative patent judge (APJ) panels when issuing decisions and increase transparency regarding Board processes. 89 Fed. Reg. 49808 (June 12, 2024).

The new rules amend and codify Title 37 of the Code of Federal Regulations (37 C.F.R. §§ 43.1 – 43.6) by adding Section 43 relating to Board proceedings pending under 37 C.F.R. §§ 41 and 42. The final rule was developed in response to a July 2022 request for comments concerning interim processes and standards in place since May 2022, and an October 2023 notice of proposed rulemaking and request for comments. The final rule codifies the interim processes set forth in Standard Operating Procedure 4 (SOP4), which replaced the standards in place since May 2022.

Under the new rules codified in §§ 43.3 and 43.4, prior to issuance of a panel decision, senior PTO management and non-management APJs (as defined in § 43.2) are barred from communicating, directly or through intermediaries, with any panel member (unless they were themselves panel members) regarding panel decisions. Limited communications are permitted for procedural status and generally applicable paneling guidance that doesn’t directly or otherwise influence the paneling or repaneling of any specific proceeding. The rules do not forbid a panel member from requesting input on a decision prior to issuance from non-panel senior APJs, however. The rules further stipulate that it is within the panel’s sole discretion to adopt any edits, suggestions or feedback from non-panel APJs.

The rule is effective July 12, 2024.



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