Centripetal Networks v. Palo Alto Networks: Federal Circuit Affirms Patent Unpatentable
Centripetal Networks challenged a lower-tribunal finding that US10542028B2 — covering rule-based network-threat detection — was unpatentable. The Federal Circuit affirmed that ruling in full on October 31, 2024, after a 588-day appeal, extinguishing enforcement leverage over Palo Alto Networks and the broader network-security sector.
Federal Circuit closes the door on Centripetal’s network-threat detection patent
Centripetal Networks, LLC — a cybersecurity patent assertion entity — appealed the invalidation of US10542028B2, a patent directed to rule-based network-threat detection systems, against Palo Alto Networks, Inc., a leading provider of enterprise network-security platforms. The appeal, docketed as Case No. 23-1654 before the Court of Appeals for the Federal Circuit on March 23, 2023, placed the patentability of a core network-security mechanism squarely before the nation’s top patent court.
On October 31, 2024, the Federal Circuit issued an affirmance, ordering that the lower-tribunal’s unpatentability determination stood without reversible error. The basis of termination was recorded as ‘Unpatentable,’ confirming that the claims of US10542028B2 did not survive scrutiny. For Palo Alto Networks, the ruling eliminates the threat of infringement liability tied to this specific patent, at least at this appellate stage. For Centripetal, the affirmance forecloses re-litigating the same validity questions at the Federal Circuit level.
A 588-day duration is consistent with typical Federal Circuit patent appeal timelines, suggesting no unusual procedural complexity. The public record does not disclose whether a settlement was considered or what specific invalidity grounds — such as anticipation or obviousness — drove the outcome; the docket records only the patentability cause and unpatentability basis. Centripetal’s appellate options beyond the Federal Circuit are limited to a petition for rehearing en banc or certiorari to the Supreme Court, both of which face exceptionally high bars.
Filing to Unpatentable in 588 days
588 days on appeal — consistent with average Federal Circuit patent appeal timelines of 18–24 months
Federal Circuit affirms: what the ruling means for both parties
What ‘AFFIRMED’ means at the Federal Circuit
An affirmance means the Federal Circuit reviewed the record and found no reversible error in the lower tribunal’s unpatentability determination. The appellate court does not re-try the case; it applies deferential standards — such as substantial evidence for factual findings — to assess whether the prior decision was legally sound. Here, the court’s order confirms the invalidity conclusion holds as a matter of law and fact.
No reversible error foundUS10542028B2 is unpatentable — Centripetal’s enforcement path is closed
For Centripetal Networks, the affirmance is a decisive setback. The patent’s claims have been confirmed unpatentable, stripping the asset of enforceability at this level. Centripetal cannot assert US10542028B2 against Palo Alto Networks or third parties on the basis of this claim scope. Any future enforcement strategy in the rule-based network-threat detection space must rest on separately validated patents within its portfolio.
Patent unenforceablePalo Alto Networks secures freedom to operate without this patent overhead
For Palo Alto Networks, the affirmance confirms freedom to operate its network-threat detection features without liability exposure from US10542028B2. The ruling also raises the bar for any future Centripetal assertion based on the same or closely related claim scope. Having successfully defended through appeal, Palo Alto’s legal position on this technology is substantially strengthened for the foreseeable future.
FTO confirmed on this patentStrengthened FTO across network-security vendors in the rule-based detection space
The Federal Circuit’s affirmance signals that the claim architecture of US10542028B2 could not withstand patentability review, which typically benefits the broader competitive field. Network-security vendors deploying rule-based threat-detection logic may now operate with greater confidence that this specific patent overhead has been neutralised. The ruling may also deter parallel assertion campaigns Centripetal may have been pursuing against other market participants using related technology.
Sector-wide FTO benefitFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Centripetal Networks, LLC | Company | Cybersecurity patent assertion entity — holder of US10542028B2 covering rule-based network-threat detectionSearch in Eureka ↗ |
| Defendant | Palo Alto Networks, Inc. | Company | Palo Alto Networks, Inc. — enterprise network-security platform provider and appellant beneficiarySearch 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 | Ryan C. Brunner | 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 order — ‘THIS CAUSE having been considered, it is ORDERED AND ADJUDGED: AFFIRMED’ — is unqualified. There is no partial reversal, remand, or modification of the lower decision. At the appellate level, this phrasing typically reflects the court’s application of deferential review standards — substantial evidence for factual patentability findings and de novo review for legal conclusions — finding no grounds to disturb the unpatentability determination. For Centripetal, all claim-level arguments raised on appeal were rejected. For Palo Alto Networks, the ruling is final at this court level.
US10542028B2 — Rule-Based Network-Threat Detection Systems
US10542028B2, filed under application number US16/554252, is directed to rule-based network-threat detection — a class of cybersecurity technology that applies structured logic rules to identify and respond to anomalous or malicious network activity. This technical domain sits at the intersection of network-security infrastructure and intelligent traffic analysis, addressing the challenge of detecting cyber threats at scale using rule-driven frameworks rather than purely signature-based or ML-dependent approaches. The patent’s claims sought to protect specific implementations of this detection logic.
Strategically, US10542028B2 represented a potentially broad enforcement asset in the enterprise network-security market — a sector where Palo Alto Networks, Cisco, Fortinet, and others compete intensively. Rule-based threat detection is foundational to next-generation firewalls, SIEM platforms, and XDR systems. Centripetal Networks has historically pursued aggressive assertion campaigns in cybersecurity, making portfolio-wide patent monitoring essential for vendors operating in this space. The Federal Circuit’s unpatentability affirmance removes this specific asset but does not neutralise related patents that may cover overlapping technology.
Should you run an FTO analysis against US10542028B2?
Any R&D team or product manager building rule-based threat-detection, network-anomaly detection, or automated firewall-rule generation features should assess potential exposure to Centripetal Networks’ broader patent portfolio. While US10542028B2 has been declared unpatentable and affirmed as such by the Federal Circuit — making it unenforceable — related patents claiming priority to similar underlying technology may still be active. A targeted FTO review should cover Centripetal’s full patent family and pending applications.
PatSnap Eureka’s FTO Search Agent allows IP teams to map the claim scope of US10542028B2 against current product architectures, identify live family members, and surface prior art that informed the invalidity finding. This enables both defensive clearance for product launches and proactive intelligence for litigation strategy. Search the full Centripetal Networks cybersecurity portfolio directly in Eureka to benchmark freedom-to-operate exposure across your specific feature set.
Run a freedom-to-operate analysis on US10542028B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit appeals in network-security patent litigation
Cases involving rule-based network-threat detection and cybersecurity patents appealed to the Federal Circuit, where patentability was the central issue.
What this case signals for the network-security IP landscape
The Federal Circuit’s affirmance in Case 23-1654 carries practical consequences beyond the two named parties in the network-security sector.
Rule-based threat detection claims face elevated invalidity risk post-affirmance
The Federal Circuit’s confirmation that US10542028B2 was unpatentable suggests that broadly drafted rule-based network-threat detection claims may face heightened scrutiny in IPR or district court proceedings. Companies holding similar patents should audit claim scope against prior art before initiating enforcement campaigns.
Palo Alto Networks’ successful appeal strategy signals viable IPR/PTAB playbook
Palo Alto Networks’ ability to secure an unpatentability finding — subsequently affirmed at the Federal Circuit — is consistent with a successful post-grant review strategy. For defendants facing similar assertion campaigns, this case suggests PTAB-level challenges to network-security patents can yield durable results that withstand appellate review.
Centripetal v Palo — key questions answered
The Federal Circuit affirmed the lower tribunal’s finding that US10542028B2 was unpatentable. The order issued October 31, 2024, confirmed no reversible error in the unpatentability determination, effectively ending Centripetal’s ability to enforce this patent against Palo Alto Networks at the federal appellate level.
US10542028B2, filed under application US16/554252, covers rule-based network-threat detection systems — technology that uses structured logic rules to identify and respond to malicious or anomalous network traffic. This category is foundational to next-generation firewalls, SIEM platforms, and XDR security products.
Following a Federal Circuit affirmance, Centripetal’s remaining options are a petition for rehearing en banc before the full Federal Circuit or a petition for certiorari to the U.S. Supreme Court. Both routes carry very high bars and low success rates. The public record does not indicate whether Centripetal has pursued or intends to pursue either avenue.
The Federal Circuit’s ruling in Case 23-1654 applies specifically to US10542028B2. It does not directly affect the validity or enforceability of other Centripetal Networks patents. However, the unpatentability finding on closely related claim architecture may inform prior art arguments in any parallel or future proceedings involving related family members.
A termination basis of ‘Unpatentable’ indicates the underlying proceeding — most likely a PTAB post-grant review such as an IPR — concluded that the claims of US10542028B2 failed to satisfy patentability requirements. The Federal Circuit’s affirmance means this conclusion was reviewed and upheld on appeal, making the unpatentability determination final at the circuit level.
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