Centripetal Networks v. Palo Alto Networks: Federal Circuit Affirms Unpatentability
Centripetal Networks appealed an unpatentability finding for US10749906B2 — a patent covering methods and systems for protecting a secured network — against cybersecurity giant Palo Alto Networks. The Federal Circuit affirmed under Rule 36 in a 399-day appellate proceeding, leaving the patent’s cancellation intact.
Federal Circuit closes Centripetal’s appeal with a Rule 36 affirmance
Centripetal Networks, LLC — a network security IP holding company — filed this appeal at the Court of Appeals for the Federal Circuit on 10 April 2023, challenging an earlier invalidity or cancellation ruling against US10749906B2. That patent, filed under application number US16/448969, claims methods and systems for protecting a secured network, a core area of enterprise cybersecurity technology. The appellee, Palo Alto Networks, Inc., is a leading provider of network security platforms and a significant commercial rival in the space covered by the disputed patent.
The Federal Circuit closed the case on 13 May 2024, issuing an affirmance under Federal Circuit Rule 36 — a summary disposition indicating the court found no reversible error in the decision below and that a full written opinion was not warranted. The basis of termination is recorded as ‘Unpatentable,’ confirming that US10749906B2 does not survive the challenge. For Centripetal, the affirmance extinguishes any enforcement or licensing leverage derived from this patent against Palo Alto Networks and potentially against third parties.
A Rule 36 judgment typically signals that the appellate panel considered the legal and factual record sufficient to resolve the appeal without extended analysis, which may suggest the unpatentability arguments were well-established on the record. The 399-day duration is consistent with a contested appellate proceeding including briefing and potentially oral argument. What remains unknown from the public record is whether Centripetal will seek en banc rehearing or petition the Supreme Court, and whether related patents in its portfolio may face similar invalidity challenges from Palo Alto Networks.
Filing to Unpatentable in 399 days
399 days — slightly above median Federal Circuit appeal duration of ~12 months
Federal Circuit affirms: what the Rule 36 ruling means for both parties
A Rule 36 affirmance: the Federal Circuit found no reversible error
When the Federal Circuit issues a judgment under Rule 36, it affirms the decision below without a written opinion, signalling that the panel found the lower tribunal’s reasoning legally sound and the outcome clearly correct on the existing record. It is not a default — it still constitutes a binding appellate judgment. Here, the unpatentability finding against US10749906B2 is fully upheld, with no corrective analysis offered to Centripetal.
Binding affirmance, no written opinionCentripetal’s patent is cancelled — enforcement rights extinguished
With the Federal Circuit affirming unpatentability, Centripetal Networks loses the ability to assert US10749906B2 in litigation or licensing negotiations. The patent’s cancelled status is now final at this appellate level, removing a key asset from Centripetal’s network security IP portfolio. Centripetal’s only remaining avenue would be an en banc petition or a certiorari petition to the Supreme Court — both of which carry very low success rates.
Patent cancelled — no further enforcementPalo Alto Networks secures a clean appellate win
Palo Alto Networks successfully defended the unpatentability finding through appeal, eliminating US10749906B2 as a threat to its network security products. The Rule 36 affirmance provides Palo Alto Networks with strong finality — no remand, no corrective action required. This result also raises the bar for any future Centripetal assertion from related patents, as courts and tribunals may scrutinise the portfolio’s validity more closely following this outcome.
Full appellate victory for Palo Alto NetworksSector signal: network security patents face sustained validity scrutiny
This affirmance is consistent with a broader trend of Federal Circuit and USPTO tribunals applying rigorous validity standards to network security method patents. For vendors operating in the enterprise cybersecurity space, the outcome suggests that broadly claimed ‘methods and systems for protecting a secured network’ face meaningful invalidation risk. Competitors monitoring Centripetal’s portfolio should note that a confirmed unpatentability finding at the Federal Circuit level is a strong signal for FTO analysis of related claims.
Heightened validity risk for network security claimsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Centripetal Networks, LLC | Company | Network security IP licensor — holder of US10749906B2 covering secured network protection methodsSearch in Eureka ↗ |
| Defendant | Palo Alto Networks, Inc. | Company | Palo Alto Networks, Inc. — global enterprise cybersecurity platform providerSearch in Eureka ↗ |
| Plaintiff counsel | Bradley Charles Wright | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff counsel | James R. Hannah | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jeffrey Price | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff counsel | John R. Hutchins | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Paul J. Andre | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Scott M. Kelly | Attorney | Counsel for Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Banner & Witcoff, Ltd. | Law Firm | Representing Centripetal Networks, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Kramer, Levin, Naftalis & Frankel LLP | Law Firm | Representing Centripetal Networks, LLCSearch in Eureka ↗ |
| Defendant counsel | Andrew T. Radsch | Attorney | Counsel for Palo Alto Networks, Inc.Search in Eureka ↗ |
| Defendant counsel | Colin Dunn | Attorney | Counsel for Palo Alto Networks, Inc.Search in Eureka ↗ |
| Defendant counsel | Douglas Hallward Driemeier | Attorney | Counsel for Palo Alto Networks, Inc.Search in Eureka ↗ |
| Defendant counsel | James Richard Batchelder Esq. | Attorney | Counsel for Palo Alto Networks, Inc.Search in Eureka ↗ |
| Defendant law firm | Ropes & Gray, LLP | Law Firm | Representing Palo Alto Networks, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The Federal Circuit’s one-line disposition — ‘AFFIRMED. See Fed. Cir. R. 36.’ — is the court’s most economical but conclusive form of judgment. Rule 36 affirmances are issued when the panel unanimously finds no reversible error and determines that a written opinion would add nothing of precedential value. Importantly, this is not a merits avoidance: the court reviewed the record and affirmed the unpatentability conclusion in full. At the Federal Circuit, the standard of review for PTAB factual findings is substantial evidence; legal conclusions are reviewed de novo. The absence of a written opinion forecloses detailed claim-by-claim analysis but leaves the cancellation of US10749906B2 legally final.
US10749906B2 — Methods and systems for protecting a secured network
US10749906B2, filed under application number US16/448969, claims methods and systems directed at protecting a secured network — a technology domain central to enterprise cybersecurity infrastructure. The patent sits within the broader field of network threat detection, traffic filtering, and access control, areas that have seen intense patenting activity as organisations invest heavily in perimeter and zero-trust security architectures. The patent’s grant suggests it originally overcame prior art challenges at the USPTO, making the subsequent unpatentability finding at the PTAB and Federal Circuit level particularly significant.
For the network security sector, patents of this type typically underpin licensing assertions and litigation campaigns against platform vendors offering next-generation firewall, threat intelligence, and network monitoring products. Palo Alto Networks’ core product lines — including its NGFW and Cortex platform — operate directly in the technical space this patent addresses, which explains the strategic importance of the validity challenge. With the patent now confirmed as unpatentable by the Federal Circuit, vendors in the enterprise cybersecurity market face one fewer assertion risk from Centripetal’s portfolio, though related patents and continuations warrant continued monitoring.
Should you run an FTO analysis against Centripetal’s network security portfolio?
For R&D teams and product counsel at companies developing network protection systems, traffic filtering solutions, or zero-trust security architectures, the cancellation of US10749906B2 removes one obstacle — but Centripetal Networks is a prolific patent filer in this domain. Before assuming a clean FTO on methods for protecting secured networks, teams should map the full Centripetal patent family, identify any live continuation applications descending from US16/448969, and review forward citations to capture overlapping claim scope in related grants.
PatSnap Eureka’s FTO Search Agent automates this process: enter US10749906B2 or application number US16/448969, and Eureka surfaces related patent families, identifies co-pending applications, maps claim similarity scores across the Centripetal portfolio, and flags jurisdiction-specific risk. For cybersecurity product teams preparing for commercial launch or investor diligence, a Eureka-powered FTO analysis can compress weeks of manual review into a structured, auditable report.
Run a freedom-to-operate analysis on US10749906B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit appeals in network security patent validity
These Federal Circuit cases involve comparable network security method patents challenged on unpatentability grounds — directly relevant to the Centripetal v. Palo Alto Networks outcome.
What this case signals for the network security IP landscape
The Federal Circuit’s Rule 36 affirmance in Centripetal v. Palo Alto Networks carries practical consequences well beyond the two parties involved.
Rule 36 affirmances carry full precedential weight on validity
A Federal Circuit Rule 36 judgment, while silent on reasoning, is a final and binding disposition. For practitioners advising clients on network security patent portfolios, this outcome confirms that US10749906B2 is unpatentable with no room for further district court relitigation on those same claims. Monitor Centripetal’s remaining portfolio for related claim families that may now be challenged on similar grounds.
Palo Alto Networks’ IPR or PTAB strategy proved decisive
The basis of termination — ‘Unpatentable’ — is consistent with a PTAB invalidity proceeding (IPR or PGR) that was then appealed to the Federal Circuit. This suggests Palo Alto Networks successfully leveraged post-grant review mechanisms to cancel the patent without a full district court trial, a cost-efficient and increasingly common defence strategy in high-stakes cybersecurity patent disputes.
Centripetal v Palo — key questions answered
The Federal Circuit affirmed the unpatentability of US10749906B2 under Rule 36, issuing a summary judgment without a written opinion. This confirms the cancellation of Centripetal’s patent covering methods and systems for protecting a secured network, ending the appeal in Palo Alto Networks’ favour.
A Rule 36 affirmance is issued when the Federal Circuit panel unanimously finds no reversible error in the decision below and determines a written opinion is unnecessary. It is a fully binding judgment — not a procedural dismissal — but provides no written reasoning, which limits its value as persuasive precedent in future proceedings.
No. The Federal Circuit’s affirmance of the unpatentability finding means US10749906B2 is cancelled and no longer enforceable. Centripetal Networks would need to pursue an en banc rehearing petition or a Supreme Court certiorari petition to reverse this outcome, both of which are statistically unlikely to succeed.
US10749906B2 claims methods and systems for protecting a secured network, placing it within enterprise cybersecurity — specifically network threat detection, traffic control, and access protection. This technology domain overlaps directly with products offered by Palo Alto Networks, making the patent’s validity a commercially high-stakes question for the network security industry.
The confirmed unpatentability of US10749906B2 at the Federal Circuit level suggests that Centripetal’s broadly claimed network security method patents face meaningful validity risk. Vendors should monitor Centripetal’s remaining portfolio for related patents, assess continuation applications from US16/448969, and consider whether prior IPR filings against related Centripetal patents could succeed on similar grounds.
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