Longhorn Automotive v. Mazda Motor: 4-Patent Infringement Action Dismissed With Prejudice
Longhorn Automotive Group LLC asserted four patents against Mazda Motor Corporation’s CX and MX vehicle lines in the Eastern District of Texas. After 458 days of litigation, the parties jointly moved to dismiss all claims with prejudice — each side bearing its own costs and fees.
Four-patent automotive IP dispute resolved quietly before trial
Longhorn Automotive Group LLC filed suit against Mazda Motor Corporation on August 20, 2024, in the Eastern District of Texas before Chief Judge Rodney Gilstrap — one of the most active patent benches in the United States. The complaint asserted four issued U.S. patents (US8265353B2, US7513238B2, US8810803B2, and US7987002B2) against a broad range of Mazda vehicles including the CX-30, CX-5, CX-50, CX-70, CX-90, MX-5 Miata, Mazda3 Sedan, and Mazda3 Hatchback, among others.
The case closed on November 21, 2025, when Judge Gilstrap granted the parties’ joint motion to dismiss all claims with prejudice. A with-prejudice dismissal is a final adjudication on the merits for procedural purposes: Longhorn cannot reassert these four patents against Mazda for the same accused products in a future action. The court ordered each side to bear its own costs and attorneys’ fees, which typically signals a negotiated resolution rather than a litigated outcome.
The 458-day duration is notable — longer than many E.D. Texas patent cases that settle in the first year — suggesting substantive claim construction or licensing discussions may have preceded the joint dismissal. Because the motion was jointly filed and the terms are confidential, the public record does not reveal whether any license, design-around, or other commercial arrangement underpins the resolution. The companion lead case (2:24-cv-00933-JRG) remains open, indicating Longhorn’s broader enforcement campaign against other defendants is ongoing.
Filing to Dismissed with Prejudice in 458 days
458 days — longer than the E.D. Texas median, suggesting substantive negotiation before resolution
Dismissed with prejudice: what the joint motion means for both parties
With-prejudice dismissal bars any identical future claim
A dismissal with prejudice operates as a final judgment on the merits. Under Rule 41(a), a joint stipulation of dismissal with prejudice extinguishes the plaintiff’s right to re-file the same claims against the same defendant. Longhorn Automotive cannot bring these four patents against Mazda for the same accused vehicle platforms in any future action — the claim is permanently resolved.
Rule 41 — permanent bar on re-filingLonghorn surrenders reassertion rights but may have secured a deal
By agreeing to a with-prejudice dismissal, Longhorn Automotive gave up the ability to litigate these specific claims against Mazda again. However, such outcomes frequently reflect an undisclosed licence, royalty arrangement, or design-around agreement. The each-side-bears-own-costs order is consistent with a commercially negotiated exit. Longhorn’s broader enforcement campaign continues via the still-open lead case No. 2:24-cv-00933.
Possible undisclosed licenceMazda achieves finality — but patent risk is not fully extinguished
For Mazda, the with-prejudice dismissal provides certainty that Longhorn cannot re-litigate these four patents against the named vehicle models. However, Mazda bears its own legal costs and the patents remain in force — meaning other potential plaintiffs, or Longhorn pursuing different products, are not precluded. The absence of an invalidity or non-infringement ruling leaves the patents’ validity unchallenged on the public record.
Finality on these claims onlyFour automotive patents survive unchallenged — sector risk persists
Because the case resolved before any merits ruling, all four asserted patents remain valid and enforceable. Competing automakers and Tier 1 suppliers whose vehicles incorporate similar technology cannot rely on this outcome as precedent. The lack of a claim construction order or invalidity finding means the patents’ scope is unchanged — raising FTO risk for any manufacturer operating in the same technology space as Mazda’s accused CX and MX platforms.
Patents remain enforceableFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Longhorn Automotive Group LLC | Company | Automotive IP licensing entity — holder of US8265353B2, US7513238B2, US8810803B2, US7987002B2Search in Eureka ↗ |
| Defendant | Mazda Motor, Corp. | Company | Mazda Motor Corporation — Japanese multinational automaker, global CX and MX vehicle linesSearch in Eureka ↗ |
| Plaintiff counsel | Alfred Ross Fabricant | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | Enrique William Iturralde | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | John Andrew Rubino | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | Justin Kurt Truelove | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | Michael Mondelli , III | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | Peter Lambrianakos | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff counsel | Vincent J. Rubino , III | Attorney | Counsel for Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fabricant LLP | Law Firm | Representing Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fabricant LLP (NY) | Law Firm | Representing Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff law firm | Rubino Ip | Law Firm | Representing Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff law firm | Rubino Law LLC | Law Firm | Representing Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Plaintiff law firm | Truelove Law Firm | Law Firm | Representing Longhorn Automotive Group LLCSearch in Eureka ↗ |
| Defendant counsel | Matthew D. Satchwell | Attorney | Counsel for Mazda Motor, Corp.Search in Eureka ↗ |
| Defendant counsel | Matthew Ganas | Attorney | Counsel for Mazda Motor, Corp.Search in Eureka ↗ |
| Defendant law firm | DLA Piper LLP (US) | Law Firm | Representing Mazda Motor, Corp.Search in Eureka ↗ |
| Defendant law firm | DLA Piper US LLP (Chicago) | Law Firm | Representing Mazda Motor, Corp.Search in Eureka ↗ |
| Presiding judge | Judge Rodney Gilstrap | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order is procedural rather than substantive: it grants a joint motion and dismisses all claims with prejudice, expressly ordering each side to bear its own costs and fees. No invalidity, non-infringement, or claim construction finding was issued. The phrase ‘DISMISSED WITH PREJUDICE’ forecloses Longhorn from reasserting these patents against Mazda on these products, but leaves all four patents valid and in force against the rest of the market. The companion lead case is explicitly preserved, confirming the litigation campaign continues.
US8265353B2, US7513238B2, US8810803B2 & US7987002B2 — Automotive Sensing & Imaging
The four asserted patents — US8265353B2, US7513238B2, US8810803B2, and US7987002B2 — cover technologies in the automotive sensing, imaging, and vehicle-control domain. Their application dates span from the mid-2000s to the early 2010s, a period of rapid development in camera-based driver assistance and in-vehicle optical systems. The patents are registered in the United States and were asserted against a broad swath of Mazda’s current model lineup, suggesting the claimed inventions map onto components common across modern vehicle platforms.
With all four patents surviving the Longhorn v. Mazda proceeding without any validity challenge on the record, they remain fully enforceable assets. For OEMs, Tier 1 suppliers, and technology integrators whose products incorporate similar imaging, sensing, or processing architectures — including those supplying cameras, LiDAR pre-processing, or ADAS modules — these patents represent a live FTO concern. The breadth of the accused product list (twelve named Mazda models across CX, MX, and Mazda3 lines) suggests Longhorn views the relevant claims as reading on widely deployed vehicle-platform technology rather than a narrow bespoke system.
Should you run an FTO against these four automotive sensing patents?
Any automaker, Tier 1 supplier, or ADAS technology provider whose products include camera-based imaging, optical sensing, or driver-assistance processing systems should treat these four patents as live FTO items. The Mazda dismissal does not create prior-art estoppel or a collateral estoppel shield for third parties. With the lead case still open and Fabricant LLP actively filing in E.D. Texas, the probability of further assertions in this technology area is elevated.
PatSnap Eureka’s FTO Search Agent enables R&D and IP teams to map claim language from US8265353B2, US7513238B2, US8810803B2, and US7987002B2 against your product specifications in minutes — identifying claim elements that overlap with your vehicle sensing or imaging architecture. Eureka’s litigation monitoring layer also flags new complaints filed by Longhorn Automotive or Fabricant LLP, giving you early warning before a complaint lands on your docket.
Run a freedom-to-operate analysis on US8265353B2 to assess your product’s exposure
Run FTO in Eureka →Similar automotive patent enforcement actions in E.D. Texas
Cases involving automotive sensing and imaging patents asserted by NPEs before Judge Gilstrap in the Eastern District of Texas follow recognisable patterns.
What this case signals for the automotive IP enforcement landscape
Longhorn’s multi-defendant campaign in E.D. Texas targets core vehicle systems. Dismissal here does not end the wider threat.
E.D. Texas remains the forum of choice for automotive NPE actions
Judge Gilstrap’s docket continues to attract patent assertion entities targeting automakers. The combination of plaintiff-friendly scheduling orders, fast trial dates, and large jury verdicts in the district makes E.D. Texas a credible litigation threat — even where, as here, cases resolve before trial. Automakers without a proactive patent monitoring strategy face surprise filings.
Joint dismissal with own-costs is a hallmark of a confidential licence
The each-side-bears-own-costs order and joint motion structure are consistent with a commercial resolution. When an NPE accepts own-costs in a with-prejudice dismissal, it typically signals that the defendant provided value — whether monetary or via a design-around — in exchange for finality. This pattern repeats across Fabricant LLP’s broader litigation portfolio.
Longhorn v Mazda — key questions answered
A dismissal with prejudice in case 2:24-cv-00686 means all of Longhorn’s claims against Mazda are permanently extinguished. Longhorn cannot refile the same patent infringement claims (US8265353B2, US7513238B2, US8810803B2, US7987002B2) against Mazda for the same accused vehicles in any future proceeding. The four patents themselves remain valid and enforceable against other defendants.
Longhorn Automotive Group LLC asserted four U.S. patents: US8265353B2, US7513238B2, US8810803B2, and US7987002B2. These patents relate to automotive imaging, sensing, and vehicle-control technologies. They were asserted against twelve named Mazda models including the CX-30, CX-5, CX-50, CX-70, CX-90, MX-5 Miata, Mazda3 Hatchback, and Mazda3 Sedan, among others.
The public record does not disclose the commercial terms underpinning the joint dismissal. The each-side-bears-own-costs order and with-prejudice structure are consistent with a confidential licence or settlement. Joint motions of this type in E.D. Texas NPE litigation typically signal a commercially negotiated resolution, though neither party has confirmed this publicly.
Yes. The Mazda matter (2:24-cv-00686) was a member case consolidated under lead case No. 2:24-cv-00933-JRG, which the court explicitly directed to remain open. This indicates that Longhorn Automotive, represented by Fabricant LLP, is pursuing at least one additional defendant on the same or related patent claims in the Eastern District of Texas.
No. Because the case resolved without any invalidity or non-infringement ruling, no collateral estoppel or precedential finding protects third parties. All four asserted patents remain in force and can be enforced against other automakers, Tier 1 suppliers, or technology providers whose products read on the claims. Competitors to Mazda operating in the automotive imaging and sensing space should conduct independent FTO analysis.
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