Foras Technologies v. Nissan & ZF Friedrichshafen: Lockstep Processor Case Dismissed With Prejudice
Foras Technologies asserted three US patents covering lockstep processor boot recovery and firmware protection against automotive giants Nissan Motor Co. and ZF Friedrichshafen AG. After 512 days in the Western District of Texas, Foras voluntarily dismissed all claims with prejudice before either defendant filed an answer — permanently closing the door on these specific claims.
Three Lockstep Patents, Two Automotive Defendants, One Permanent Exit
On June 6, 2023, Foras Technologies, Ltd. filed suit in the Western District of Texas (Austin Division) against Nissan Motor Co., Ltd. and ZF Friedrichshafen AG, alleging infringement of US7502958B2, US7627781B2, and US7624302B2 — a trio of patents directed at lockstep processor architectures used to detect, survive, and recover from processor faults in safety-critical systems. The asserted products involve systems and methods for establishing spare processors during boot and enabling firmware-level lockstep protection, technology highly relevant to automotive ECU and ADAS platforms.
On October 25, 2024, Foras filed a notice of voluntary dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(i). Because neither Nissan nor ZF Friedrichshafen had yet served an answer or motion for summary judgment, no court order was required — the filing was self-effectuating. Dismissal with prejudice means Foras is permanently barred from asserting the same claims against the same defendants in any future action, a materially stronger concession than a without-prejudice exit.
The case ran for 512 days before Foras’s exit, an extended runway for a pre-answer termination that suggests the parties engaged in significant behind-the-scenes activity — potentially including licensing negotiations, claim-scope analysis, or an undisclosed settlement. The public record is silent on whether any consideration changed hands. What remains clear is that both Nissan and ZF Friedrichshafen avoided any merits adjudication, leaving the validity and enforceability of all three asserted patents unresolved by this proceeding.
Filing to Voluntary dismissal in 512 days
512 days — longer than the W.D. Texas median for pre-answer dismissals, suggesting substantive pre-litigation activity
Dismissed with prejudice: what Rule 41 finality means for both parties
Rule 41(a)(1)(A)(i): self-effectuating, no court order needed
Federal Rule 41(a)(1)(A)(i) permits a plaintiff to dismiss an action unilaterally before the opposing party serves an answer or a motion for summary judgment. The filing of the notice itself terminates the case — no judicial order is required. Here, neither Nissan nor ZF Friedrichshafen had answered, so Foras’s October 25, 2024 notice was immediately operative. The court’s closure order was confirmatory only, consistent with Fifth Circuit precedent in In re Amerijet Int’l.
Rule 41(a)(1)(A)(i) — pre-answer voluntary exitWith prejudice: Foras cannot refile these claims against Nissan or ZF
A dismissal with prejudice operates as a final adjudication on the merits for res judicata purposes. Unlike a without-prejudice dismissal — which preserves the right to refile — Foras has permanently surrendered its ability to reassert US7502958B2, US7627781B2, and US7624302B2 against these two defendants. This is a significant concession that goes beyond a mere tactical pause, though the public record does not reveal whether any commercial arrangement drove the decision.
Res judicata bar — refiling against same defendants blockedNissan and ZF exit without any merits finding or validity ruling
Both defendants avoided claim construction, invalidity analysis, and any infringement determination. No finding was made on the validity or scope of the three asserted lockstep patents. While the with-prejudice dismissal protects Nissan and ZF from future suit by Foras on these patents, it does not invalidate the patents — leaving the IP theoretically enforceable against other parties in the automotive and embedded systems sectors.
No invalidity ruling — patents survive for third partiesThree live lockstep patents remain a latent risk across the automotive supply chain
The dismissal with prejudice resolves this specific dispute but leaves US7502958B2, US7627781B2, and US7624302B2 intact and potentially enforceable against other OEMs, Tier-1 suppliers, and semiconductor vendors deploying lockstep processor architectures in safety-critical automotive systems. The 512-day runway before exit, combined with the with-prejudice election, is consistent with — though does not confirm — a licensing resolution that could be a model for future assertions.
Automotive ECU & ADAS sector — residual patent riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Foras Technologies, Ltd. | Company | Patent assertion entity — holder of US7502958B2, US7627781B2 and US7624302B2 covering lockstep processor recoverySearch in Eureka ↗ |
| Defendant | Nissan Motor Co., Ltd. | Company | Nissan Motor Co., Ltd. (automotive OEM) and ZF Friedrichshafen AG (Tier-1 automotive systems supplier)Search in Eureka ↗ |
| Co-Defendant | ZF Friedrichshafen, AG | Company | Search in Eureka ↗ |
| Plaintiff counsel | Ashley Marie Ratycz | Attorney | Counsel for Foras Technologies, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Brett E. Cooper | Attorney | Counsel for Foras Technologies, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Drew B. Hollander | Attorney | Counsel for Foras Technologies, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Jonathan Randy Yim | Attorney | Counsel for Foras Technologies, Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Seth Raymond Hasenour | Attorney | Counsel for Foras Technologies, Ltd.Search in Eureka ↗ |
| Plaintiff law firm | BC Law Group, PC | Law Firm | Representing Foras Technologies, Ltd.Search in Eureka ↗ |
| Defendant counsel | Binal J. Patel | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | John R. Hutchins | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Lauren Christine Ditty | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Paige Arnette Amstutz | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Paul Thomas Qualey | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Wesley W. Jones | Attorney | Counsel for Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Banner & Witcoff, Ltd. | Law Firm | Representing Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Scott Douglass & McConnico LLP | Law Firm | Representing Nissan Motor Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Robert Pitman | Judge | Texas Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s closure order confirms that Foras’s Rule 41(a)(1)(A)(i) notice was self-effectuating under Fifth Circuit authority. The with-prejudice designation is the operative legal fact: it forecloses any future action by Foras against Nissan and ZF on these three patents, functioning as a merits-equivalent bar without any substantive adjudication. Critically, no validity or infringement findings were made, meaning the patents remain presumptively valid and enforceable against the broader market.
US7502958B2, US7627781B2 & US7624302B2 — Lockstep Processor Boot Recovery & Firmware Protection
The three asserted patents — US7502958B2, US7627781B2, and US7624302B2 — form a coordinated portfolio covering lockstep processor fault resilience. US7502958B2 addresses establishing a spare processor to recover from loss of lockstep in a boot processor. US7627781B2 covers firmware-level methods for providing recoverable lockstep protection. US7624302B2 claims methods for dynamically switching the boot processor role to a spare upon lockstep failure detection. All three applications were filed in the 10/97xxxx series, consistent with a mid-2000s priority date, predating the mass adoption of dual-core lockstep MCUs in automotive safety systems.
Lockstep processor architectures are foundational to ASIL-C and ASIL-D compliant electronic control units under ISO 26262. Microcontrollers such as the Texas Instruments TMS570 and Infineon AURIX families implement hardware lockstep as a core safety mechanism. The Foras portfolio, if its claims read on these implementations, would implicate a wide segment of the automotive Tier-1 and semiconductor supply chain. The fact that both Nissan (a major global OEM) and ZF Friedrichshafen (a leading Tier-1 safety-systems supplier) were named simultaneously suggests Foras may have viewed the patents as covering both end-product deployment and component-level supply.
Should your team run an FTO against US7502958B2, US7627781B2 & US7624302B2?
Any company designing, supplying, or integrating lockstep processor architectures into safety-critical automotive, industrial, or aerospace systems should treat these three patents as active FTO targets. The dismissal with prejudice removes Nissan and ZF from the risk pool for these patents but does not affect third-party exposure. OEMs sourcing lockstep-enabled ECUs, semiconductor vendors licensing lockstep IP cores, and Tier-1 suppliers developing ADAS or chassis control units are all potentially within the claim scope.
PatSnap Eureka’s FTO Search Agent can map the claim language of US7502958B2, US7627781B2, and US7624302B2 against your product architecture and flag prior art that could support an IPR petition. Use Eureka to identify design-around opportunities, assess claim construction risk, and benchmark these patents against the broader lockstep processor IP landscape — including competing portfolios from automotive semiconductor and systems vendors.
Run a freedom-to-operate analysis on US7502958B2 to assess your product’s exposure
Run FTO in Eureka →Similar Lockstep Processor & Automotive Safety-System Patent Cases in W.D. Texas
Cases involving functional-safety processor patents asserted against automotive OEMs and Tier-1 suppliers in the Western District of Texas — including lockstep and ECU fault-recovery claims.
What this case signals for the automotive functional-safety IP landscape
Three unlitigated lockstep patents, two major automotive defendants, and a with-prejudice exit: the combination warrants close attention from safety-critical systems teams.
Pre-answer dismissals with prejudice often signal an undisclosed licensing outcome
When a plaintiff voluntarily exits with prejudice before any answer is filed, it typically signals that the dispute was resolved commercially rather than abandoned. The 512-day duration in this case — far longer than necessary for a purely tactical retreat — suggests substantive engagement occurred. Companies in the automotive ECU and ADAS supply chain should monitor Foras Technologies for follow-on assertions against other defendants.
Lockstep processor patents carry direct relevance to ISO 26262 compliance architectures
The three asserted patents cover boot-time spare-processor establishment and firmware-level lockstep protection — functionality that maps closely onto ASIL-D hardware redundancy requirements under ISO 26262. Any OEM or Tier-1 supplier deploying dual-core lockstep MCUs (e.g., in radar, braking, or steering ECUs) should assess whether their implementations fall within the claim scope of US7502958B2, US7627781B2, or US7624302B2.
Foras v Nissan — key questions answered
The with-prejudice dismissal permanently bars Foras Technologies from asserting US7502958B2, US7627781B2, and US7624302B2 against Nissan Motor Co. and ZF Friedrichshafen AG in any future action. It operates as a res judicata bar as to these defendants only. The patents remain in force and theoretically enforceable against other parties in the automotive and embedded-systems sectors.
The three patents cover lockstep processor boot-recovery architectures: spare processor establishment (US7502958B2), firmware-level lockstep protection (US7627781B2), and dynamic role-switching of boot processor to spare on fault detection (US7624302B2). These mechanisms are central to ASIL-C/D hardware redundancy requirements under ISO 26262, meaning the claims potentially implicate a broad range of automotive ECU and ADAS platforms using dual-core lockstep microcontrollers.
Federal Rule of Civil Procedure 41(a)(1)(A)(i) permits a plaintiff to dismiss an action by filing a notice of dismissal before the defendant serves an answer or a motion for summary judgment. Because neither Nissan nor ZF Friedrichshafen had answered, Foras’s October 25, 2024 notice was self-effectuating under Fifth Circuit precedent (In re Amerijet Int’l, 785 F.3d 967). The court’s closure order was confirmatory only.
No. Because the case was dismissed before any substantive merits proceedings — no claim construction, no invalidity analysis, no summary judgment — the validity and scope of US7502958B2, US7627781B2, and US7624302B2 remain entirely unlitigated. The patents retain their presumption of validity under 35 U.S.C. § 282 and may be asserted in future proceedings against other defendants.
A 512-day pre-answer dismissal is atypically long for a purely tactical withdrawal, which typically occurs within weeks. The extended timeline is consistent with — though does not confirm — substantive licensing negotiations, due-diligence exchanges, or an undisclosed commercial resolution. The election of with-prejudice (rather than without-prejudice) dismissal further suggests the parties reached a definitive arrangement rather than agreeing to a temporary pause.
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