Centripetal Networks v. Palo Alto Networks: Federal Circuit Affirms Unpatentability
Centripetal Networks, LLC challenged an unpatentability finding for US10091246B2 — covering methods and systems for protecting a secured network — before the Federal Circuit. The court affirmed in a Rule 36 judgment, ending the appeal 446 days after filing without issuing a written opinion.
Federal Circuit closes door on Centripetal’s network security patent
Centripetal Networks, LLC — a network security patent assertion entity — appealed to the United States Court of Appeals for the Federal Circuit (Case No. 23-1528), seeking to overturn a finding that US10091246B2 was unpatentable. The patent in suit, filed under application number US15/413834, covers methods and systems for protecting a secured network and sits at the heart of Centripetal’s broader enforcement campaign targeting network security vendors including Palo Alto Networks, Inc.
On 13 May 2024, the Federal Circuit issued a summary affirmance under Federal Circuit Rule 36, adopting the lower tribunal’s unpatentability conclusion without issuing a written opinion. A Rule 36 judgment signals that the appellate panel found no reversible error in the reasoning below — but it does not itself constitute precedential guidance on the substantive patentability questions raised by the claims of US10091246B2.
The 446-day duration is consistent with standard Federal Circuit appeal timelines. The use of Rule 36 — reserved for cases where the panel finds further written analysis unnecessary — suggests the unpatentability record was compelling and the arguments on appeal did not raise novel legal questions. What remains unknown from the public record is the precise claim construction or prior art basis that drove the original unpatentability finding, as no written Federal Circuit opinion was published.
Filing to Unpatentable in 446 days
446 days from filing to Federal Circuit affirmance — consistent with typical Fed. Cir. appeal timelines
Federal Circuit affirms: what the Rule 36 judgment means for both parties
What ‘AFFIRMED’ under Rule 36 means at the Federal Circuit
A Federal Circuit Rule 36 affirmance means the panel found no reversible error in the decision below and deemed a written opinion unnecessary. It is a full affirmance on the merits — the lower tribunal’s unpatentability finding is adopted and stands — but it carries no precedential weight. Subsequent parties cannot cite the judgment as controlling authority on the patentability questions it implicitly resolves.
No reversible error foundCentripetal’s patent cannot be enforced following affirmance
With the unpatentability finding affirmed, US10091246B2 is cancelled or invalidated as determined below, stripping Centripetal of enforcement rights over these claims. Centripetal’s options are now severely limited: no further Federal Circuit appeal is available, and a petition for certiorari to the Supreme Court would face an extremely high bar. The commercial leverage this patent provided in licensing negotiations and litigation is eliminated.
Enforcement rights lostPalo Alto Networks secures a definitive win at appellate level
Palo Alto Networks successfully defended the unpatentability ruling through Federal Circuit review, obtaining a final judgment that eliminates US10091246B2 as an infringement threat. This affirmance raises the bar materially for any future attempt by Centripetal to assert related network security claims derived from the same application family, as the validity arguments have now been tested and rejected at both the tribunal and appellate levels.
Appellate options exhaustedNetwork security vendors gain clarity — but Centripetal’s portfolio remains active
The affirmance removes US10091246B2 from the threat landscape for vendors offering secured network protection products. However, Centripetal holds a broad portfolio of network security patents and has pursued parallel litigation aggressively. R&D and product teams in the network security sector should treat this ruling as patent-specific relief rather than portfolio-wide clearance, and continue monitoring Centripetal’s remaining IP assets for new assertion risks.
Portfolio monitoring still warrantedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Centripetal Networks, LLC | Company | Network security patent assertion entity — holder of US10091246B2Search in Eureka ↗ |
| Defendant | Palo Alto Networks, Inc. | Company | Palo Alto Networks, Inc. — enterprise cybersecurity platform and network security vendorSearch 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 | 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 counsel | Michael Morales | 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 terse ‘ORDERED and ADJUDGED: AFFIRMED. See Fed. Cir. R. 36.’ verdict is a procedural economy device, not a substantive opinion. Under the appellate standard of review applicable to patentability determinations — where legal conclusions are reviewed de novo and factual findings for substantial evidence — the panel’s decision to invoke Rule 36 indicates the record supporting unpatentability was sufficiently clear that no elaboration was warranted. The absence of a written opinion means neither party can use this judgment as precedent in future proceedings, but the unpatentability finding itself is final and binding on the parties.
US10091246B2 — Methods and systems for protecting a secured network
US10091246B2, filed under application number US15/413834, covers methods and systems for protecting a secured network — a technical domain encompassing network traffic analysis, threat detection, and access control mechanisms deployed at network perimeters or within enterprise environments. The patent sits within a concentrated area of network security innovation where claim scope frequently overlaps with broadly deployed commercial products, making patentability challenges particularly consequential.
For the network security sector, Centripetal’s patent portfolio has represented a sustained enforcement risk against vendors whose products perform packet inspection, network filtering, or threat intelligence correlation functions. US10091246B2’s cancellation removes one enforcement vector, but the broader portfolio strategy signals continued assertion risk. Competitors developing or selling network security platforms should map their product architectures against Centripetal’s remaining active claims before the next wave of assertions.
Should you run an FTO analysis against US10091246B2 and related Centripetal patents?
Any company developing or commercialising products that protect secured networks — including next-generation firewalls, intrusion detection systems, network traffic analysis platforms, or threat intelligence correlation tools — should assess their exposure to Centripetal’s surviving patent portfolio. While US10091246B2 has been found unpatentable, related patents in the same family or covering adjacent claim scope may pose active infringement risks that this ruling does not resolve.
PatSnap Eureka’s FTO Search Agent allows R&D and product teams to run structured freedom-to-operate searches against Centripetal’s full patent portfolio in minutes. By mapping claim language from surviving patents against your product’s functional architecture, Eureka helps identify specific claim elements that could trigger assertions — enabling legal and engineering teams to design around or challenge problematic claims before enforcement begins.
Run a freedom-to-operate analysis on US10091246B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit network security patent validity appeals
Cases involving network security patent unpatentability appeals at the Federal Circuit — particularly those involving post-grant proceedings and Rule 36 affirmances.
What this case signals for the network security IP landscape
A Rule 36 affirmance of unpatentability sends a clear signal about claim quality — and the limits of appellate rescue.
Rule 36 affirmances signal a weak appellate record — act on related patents now
When the Federal Circuit declines to write an opinion, it typically signals the patentability arguments raised on appeal were not close calls. For network security vendors facing related Centripetal patents, this outcome suggests the original invalidity analysis was thorough. Companies should audit exposure to Centripetal’s surviving portfolio before new assertions are filed.
IPR and post-grant proceedings remain the most effective challenge route
The unpatentability finding that was affirmed here likely originated in an inter partes review or similar post-grant proceeding. This case reinforces that USPTO post-grant challenges — when well-constructed with strong prior art — can produce durable outcomes that survive Federal Circuit scrutiny, even against a sophisticated patent holder like Centripetal.
Centripetal v Palo — key questions answered
The Federal Circuit affirmed the unpatentability of US10091246B2 in a Rule 36 summary judgment issued on 13 May 2024. The affirmance means the lower tribunal’s finding that the patent’s claims are unpatentable was upheld without a written opinion, and the patent cannot be enforced by Centripetal Networks against Palo Alto Networks or others.
Federal Circuit Rule 36 allows the court to affirm a lower decision without issuing a written opinion when the panel finds no reversible error and believes no further explanation is required. For US10091246B2, this means the unpatentability determination is final and binding on the parties, but the judgment is non-precedential and cannot be cited as controlling authority in other cases.
No. Following the affirmance of an unpatentability finding, the claims of US10091246B2 are treated as cancelled or invalid. Centripetal Networks cannot assert these specific claims in infringement proceedings. However, related patents in Centripetal’s broader network security portfolio may still be active and enforceable.
The patent at issue was US10091246B2 (application number US15/413834), which covers methods and systems for protecting a secured network. This patent is part of Centripetal Networks’ broader portfolio of network security patents that the company has used in enforcement actions against multiple cybersecurity vendors.
The affirmance removes US10091246B2 as an active threat for vendors in the network security space. However, Centripetal Networks holds additional patents covering related network protection technologies. Vendors offering firewalls, intrusion detection systems, or network traffic analysis products should conduct ongoing FTO analysis against Centripetal’s surviving patent portfolio to assess continuing exposure.
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