Sheelds Cyber v. NXP USA — Patent Infringement Dismissed With Prejudice (675 Days)
Sheelds Cyber, Ltd. filed suit against NXP USA, Inc. in the Western District of Texas asserting US11651088B2 — a patent covering cybersecurity mechanisms for automotive-grade secure CAN transceivers — against NXP’s TJA115x family and a suite of automotive development platforms. After 675 days of litigation, the court dismissed all claims with prejudice on the plaintiff’s own Rule 41(a)(2) motion.
Plaintiff-initiated dismissal ends NXP automotive cyber patent dispute
On 26 September 2023, Sheelds Cyber, Ltd. filed a patent infringement action against NXP USA, Inc. in the Western District of Texas (Judge David Alan Ezra, Case No. 1:23-cv-01169), asserting US11651088B2 — a patent covering cybersecurity architecture for secure Controller Area Network (CAN) transceivers. The accused products spanned NXP’s TJA115x secure CAN transceiver family and a broad range of automotive-grade evaluation boards and system-on-chip platforms, including GOLDBOX, S32G, S32K3, ORANGEBOX, and UCANS32K1SCT variants.
On 11 April 2025, Sheelds Cyber itself moved under Federal Rule of Civil Procedure 41(a)(2) to dismiss its own claims with prejudice — the most final form of voluntary dismissal available, permanently extinguishing any right to refile the same claims against NXP. After full briefing, Judge Ezra granted the motion on 1 August 2025. The with-prejudice designation provides NXP with a complete bar against re-litigation of these specific infringement claims tied to US11651088B2.
At 675 days, the case ran considerably longer than a typical early-stage dismissal, suggesting substantive litigation activity — potentially including claim construction briefing, discovery, or inter partes proceedings — before the plaintiff concluded that continuation was untenable or commercially undesirable. The public record does not disclose settlement consideration or fee arrangements, so whether NXP obtained any financial recovery or cost award remains unknown. The with-prejudice outcome, however, is unambiguously favorable to NXP.
Filing to Dismissed with Prejudice in 675 days
675 days — longer than the median W.D. Tex. patent case resolved without trial
Dismissed with prejudice: what the Rule 41(a)(2) outcome means for both parties
Rule 41(a)(2) dismissal with prejudice — plaintiff’s choice, permanent consequence
Under FRCP Rule 41(a)(2), a plaintiff may seek court-ordered dismissal on its own motion after the defendant has answered. Requesting dismissal ‘with prejudice’ — as Sheelds Cyber did here — permanently extinguishes the claims. Unlike a without-prejudice dismissal, this ruling functions as a final adjudication on the merits for res judicata purposes, preventing any future refiling of the same infringement claims against NXP on US11651088B2.
Permanent bar to refilingSheelds Cyber loses all infringement claims — permanently
By moving for dismissal with prejudice, Sheelds Cyber voluntarily surrendered its infringement claims against NXP with no ability to revive them in a subsequent action. The patent US11651088B2 remains in force — it has not been invalidated — but NXP cannot be sued again on these specific claims. Sheelds Cyber retains the patent and may pursue other defendants, though this outcome may signal licensing leverage was exhausted or litigation economics were unfavorable.
Claims extinguished; patent intactNXP exits litigation with a permanent shield against these claims
NXP USA, Inc. secures a with-prejudice dismissal without proceeding to trial or a merits ruling — a highly favorable outcome. The TJA115x secure CAN transceiver family and associated development platforms are effectively cleared of this specific infringement allegation. NXP’s counsel filed a response opposing the motion’s terms, suggesting the defendant may have sought additional protections (e.g., fee awards), though the public record does not confirm any such relief was granted.
NXP: full resolution, no liabilityAutomotive CAN security IP remains live — other market participants exposed
US11651088B2 survives this litigation intact and unlitigated on the merits. Sheelds Cyber retains the ability to assert it against other suppliers or OEMs in the automotive cybersecurity and secure CAN transceiver space. Competitors deploying similar hardware security architectures in vehicle network interfaces should treat this case as a signal — not a clearance — and consider dedicated FTO analysis against this patent before commercialising CAN security products.
Patent remains enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Sheelds Cyber, Ltd. | Company | Automotive cybersecurity patent licensor — holder of US11651088B2Search in Eureka ↗ |
| Defendant | NXP USA, Inc. | Company | NXP USA, Inc. — semiconductor manufacturer, automotive-grade secure CAN transceiver productsSearch in Eureka ↗ |
| Plaintiff counsel | Charles C. Koole | Attorney | Counsel for Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Jaime K. Olin | Attorney | Counsel for Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Michael D. Ricketts | Attorney | Counsel for Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Paul Joseph Skiermont | Attorney | Counsel for Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Rex Hwang | Attorney | Counsel for Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Plaintiff law firm | Skiermont Derby LLP | Law Firm | Representing Sheelds Cyber, Ltd.Search in Eureka ↗ |
| Defendant counsel | Bradley Dalton Coburn | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | G. Blake Thompson | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | Garland T. Stephens | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | Heng Gong | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | J. Mark Mann | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | Jeff C. Risher | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant counsel | Richard M. Koehl | Attorney | Counsel for NXP USA, Inc.Search in Eureka ↗ |
| Defendant law firm | Blue Peak Law Group LLP | Law Firm | Representing NXP USA, Inc.Search in Eureka ↗ |
| Defendant law firm | Mann, Tindel & Thompson Attorneys at Law | Law Firm | Representing NXP USA, Inc.Search in Eureka ↗ |
| Defendant law firm | Shelton Coburn LLP | Law Firm | Representing NXP USA, Inc.Search in Eureka ↗ |
| Defendant law firm | The Mann Firm | Law Firm | Representing NXP USA, Inc.Search in Eureka ↗ |
| Presiding judge | Judge David Alan Ezra | Judge | Texas Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order grants Sheelds Cyber’s own Rule 41(a)(2) motion and dismisses all claims with prejudice — a plaintiff-initiated but court-confirmed termination. The with-prejudice designation carries the same res judicata effect as an adverse merits judgment: Sheelds Cyber is permanently foreclosed from asserting these specific claims against NXP. Notably, NXP opposed the motion, suggesting the defendant may have sought additional terms. The order does not reflect any merits finding on US11651088B2’s validity or infringement, leaving the patent’s enforceability against third parties fully intact.
US11651088B2 — Secure CAN Transceiver Cybersecurity Architecture
US11651088B2 (application no. US17/844137) covers cybersecurity architecture applied to Controller Area Network (CAN) transceivers — the physical-layer communication components that form the backbone of in-vehicle networking in automotive systems. CAN security has become a priority technology area as vehicle connectivity expands, making the integrity of CAN bus communications a central concern for OEMs and tier-1 suppliers under ISO/SAE 21434 and UN Regulation No. 155 frameworks.
The patent’s assertion against NXP’s TJA115x family — NXP’s flagship secure CAN transceiver line used widely in ADAS, body electronics, and industrial automation — signals that Sheelds Cyber positioned this as a foundational claim in automotive network security IP. The patent was not invalidated in this proceeding, meaning it remains a live enforcement asset. Automotive semiconductor vendors, ECU developers, and vehicle OEMs integrating secure CAN transceivers from any supplier should assess their exposure to this patent’s claim scope independently.
Should you run an FTO against US11651088B2?
Any organisation developing or integrating automotive-grade secure CAN transceivers, CAN FD security modules, or automotive cybersecurity gateway hardware should treat US11651088B2 as a priority FTO target. This case demonstrates the patent is actively asserted against leading-tier semiconductor products. The with-prejudice dismissal clears NXP only — it provides no protection for other market participants. If your roadmap includes hardware-enforced CAN security, this patent’s claim scope warrants direct analysis before production release.
PatSnap Eureka’s FTO Search Agent can map the full claim landscape of US11651088B2 against your product’s technical architecture, identify relevant prior art and prosecution history estoppel, flag continuation applications that may extend coverage, and surface related Sheelds Cyber filings. Eureka’s semantic claim analysis goes beyond keyword search to identify overlap with secure CAN, CAN XL, and automotive cybersecurity hardware implementations — delivering actionable FTO intelligence for R&D, legal, and product teams.
Run a freedom-to-operate analysis on US11651088B2 to assess your product’s exposure
Run FTO in Eureka →Similar automotive cybersecurity patent cases in W.D. Texas
Explore related patent infringement actions involving automotive network security and CAN bus technology litigated in the Western District of Texas.
What this case signals for the automotive cybersecurity IP landscape
A with-prejudice plaintiff withdrawal after nearly two years raises questions about litigation economics and the enforceability posture of automotive CAN security patents.
With-prejudice dismissal by plaintiff is not the same as NXP clearing the patent
US11651088B2 was never adjudicated on validity or infringement merits. NXP is protected; other automotive semiconductor and module vendors are not. Any company shipping secure CAN transceiver products should treat this patent as an active threat requiring independent FTO analysis before drawing comfort from this dismissal.
675-day duration suggests this went well beyond pleadings before resolution
Cases dismissed this late typically reflect failed licensing negotiations, adverse claim construction signals, or IPR institution dynamics rather than early-stage weakness. R&D and IP teams monitoring this space should investigate whether parallel PTAB proceedings influenced the plaintiff’s decision to withdraw.
Sheelds v NXP — key questions answered
Dismissal with prejudice in Case No. 1:23-cv-01169 means Sheelds Cyber permanently surrendered its infringement claims against NXP USA under US11651088B2. The court granted the plaintiff’s own Rule 41(a)(2) motion on 1 August 2025. Sheelds Cyber cannot refile these claims against NXP, but US11651088B2 remains valid and enforceable against other parties.
No. The dismissal with prejudice was granted on Sheelds Cyber’s own motion and does not constitute a merits ruling on validity or infringement. US11651088B2 was never adjudicated. The patent remains in force and Sheelds Cyber retains the right to assert it against defendants other than NXP USA.
The complaint accused NXP’s TJA115x family of Secure CAN Transceivers (including TJA1152AT, TJA1152BT, TJA1153ATK) and a range of automotive development platforms: GOLDBOX, GOLDBOX-3, ORANGEBOX, S32G-VNP-EVB3/RDB2/RDB3, S32K3X5EVB-T172, S32K344/MR-CANHUBK344, S32K3-T-BOX, S32K3X4EVB-T172, KIT-UCANS32K1SCT, I.MX-RT-INDUSTRIAL-DRIVE-DEV-PLATFORM, and UCANS32K1SCT.
The public record does not disclose Sheelds Cyber’s reasons. At 675 days into litigation, a with-prejudice dismissal typically suggests one or more of: failed settlement negotiations, adverse signals from claim construction, inter partes review (IPR) proceedings affecting patent strength, or an assessment that continued litigation was commercially unviable. No settlement payment or fee award has been confirmed in the public docket.
No — it provides no FTO protection for third parties. The dismissal with prejudice binds only NXP USA. Other automotive semiconductor vendors, ECU manufacturers, and OEMs incorporating secure CAN transceiver technology must conduct independent FTO analysis against US11651088B2. Sheelds Cyber retains full rights to assert the patent against the broader market.
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