Xueshan Technologies v. Renesas Electronics — Dismissed With Prejudice After 639 Days
Xueshan Technologies, Inc. asserted four US patents against Renesas Electronics’ R-Car automotive SoC and RZ/Synergy MCU product lines in the Eastern District of Texas. The parties jointly stipulated to dismissal with prejudice on 15 February 2024, with each side bearing its own costs — suggesting a private resolution undisclosed to the public record.
Four-patent semiconductor IP dispute resolved privately in E.D. Texas
On 17 May 2022, Xueshan Technologies, Inc. filed suit against Renesas Electronics, Inc. and Renesas Electronics Corporation in the Eastern District of Texas (Case No. 2:22-cv-00157), asserting infringement of four US patents: US8117479B2, US10162642B2, US7038695B2, and US8643659B1. The accused products span Renesas’s R-Car automotive system-on-chip (SoC) lineup — including the R-Car H3, M3, V3U, D3, E2, and E3 series — as well as the RZ/G MPU family and Renesas’s Synergy S5 and S7 MCU series, representing a broad cross-section of Renesas’s embedded semiconductor portfolio.
The case closed on 15 February 2024 when both parties filed a Joint Stipulation of Dismissal, which the court accepted, dismissing all claims and causes of action with prejudice. Each party was ordered to bear its own costs, expenses, and attorneys’ fees. Dismissal with prejudice is a final adjudication on the merits as a matter of law — Xueshan is permanently barred from re-asserting the same patent claims against the same Renesas products in any future action.
At 639 days, the litigation ran well past typical early-exit timelines but stopped short of trial, consistent with a negotiated resolution reached before substantive merits rulings. The mutual cost-bearing provision and joint stipulation format suggest the parties reached a private agreement — the specific financial terms, if any, remain undisclosed. What drove resolution at this stage — whether claim construction, inter partes review risk, licensing negotiations, or commercial pressure — is not apparent from the public docket.
Filing to dismissal in 639 days
639 days — longer than many E.D. Tex. patent cases that settle pre-trial
Joint stipulation of dismissal with prejudice — what the order means
Dismissal with prejudice is a permanent bar on re-litigation
A dismissal with prejudice operates as a final judgment on the merits. Under Federal Rule of Civil Procedure 41, Xueshan Technologies is permanently barred from filing a new lawsuit asserting the same four patents against Renesas’s accused SoC and MCU products. This protection extends to all claims and causes of action explicitly raised in Case No. 2:22-cv-00157, giving Renesas substantial freedom from repeat litigation on these specific assertions.
FRCP Rule 41 — permanent barJoint stipulation typically signals a private resolution
When both parties jointly stipulate to dismissal with prejudice — rather than one party moving to dismiss — it strongly suggests a negotiated resolution has been reached. The mutual cost-bearing provision reinforces this: contested dismissals rarely result in each side absorbing its own fees. The financial terms of any such resolution are not disclosed in the public court record and may be subject to a confidentiality agreement between Xueshan and Renesas.
Private terms — undisclosedEach party bears own costs — no fee-shifting applied
The court’s order explicitly directs each party to bear its own costs, expenses, and attorneys’ fees. This is a standard provision in stipulated dismissals and does not indicate a finding of exceptionality under 35 U.S.C. § 285. Neither party obtained a cost award, consistent with the case having resolved through mutual agreement rather than a contested ruling on the merits or litigation conduct.
No § 285 fee awardAll pending relief denied as moot — clean closure
The court’s order explicitly denies all pending requests for relief not otherwise granted, as moot. This language confirms that any outstanding motions — including any claim construction, summary judgment, or discovery motions that may have been pending at the time of stipulation — were extinguished without substantive ruling. Renesas obtains a clean docket closure without adverse merits findings on any of the four asserted patents.
No substantive rulings on recordFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Xueshan Technologies, Inc. | Company | Semiconductor IP licensing entity — holder of US8117479B2, US10162642B2, US7038695B2 & US8643659B1Search in Eureka ↗ |
| Defendant | Renesas Electronics, Inc. | Company | Renesas Electronics Corporation — major Japanese semiconductor manufacturer, automotive SoC and MCU market leaderSearch in Eureka ↗ |
| Plaintiff counsel | David Thomas DeZern | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Edward R. Nelson , III | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Janson Westmoreland | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jonathan Hart Rastegar | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Nathan Louis Levenson | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Patrick Joseph Conroy | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Ryan P. Griffin | Attorney | Counsel for Xueshan Technologies, Inc.Search in Eureka ↗ |
| Defendant counsel | Melissa Richards Smith | Attorney | Counsel for Renesas Electronics, Inc.Search in Eureka ↗ |
| Presiding judge | Judge / | Chief Judge | Texas Eastern District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The stipulation’s language — ‘all claims and causes of action asserted between Plaintiff and Defendant are DISMISSED WITH PREJUDICE’ — is comprehensive in scope. It extinguishes every asserted claim under the four patents against Renesas’s named products, with no carve-outs or reservations visible in the public order. The absence of any findings on validity, infringement, or claim construction means neither party obtained a precedential ruling. For Renesas, the with-prejudice dismissal provides a durable defence against re-assertion of these specific claims; for Xueshan, the case ends without a public record of defeat on the merits.
US8117479B2, US10162642B2, US7038695B2 & US8643659B1 — Automotive SoC & MCU Architecture Patents
The four asserted patents — US8117479B2 (App. No. 12/402698), US10162642B2 (App. No. 14/172839), US7038695B2 (App. No. 10/812173), and US8643659B1 (App. No. 10/958758) — collectively span multiple generations of semiconductor architecture development. The application filing dates suggest the underlying inventions predate the current automotive SoC generation, which is consistent with foundational architecture patents being asserted against modern implementations. The specific technical claims cover areas plausibly relevant to multi-core processor management, memory architectures, and graphics or display subsystems — all core components of automotive-grade SoCs like the R-Car family.
For automotive semiconductor vendors, foundational architecture patents of this type represent persistent risk because the underlying technical concepts — processing pipelines, memory management, rendering subsystems — remain architecturally relevant across successive product generations. Renesas’s R-Car H3, V3U, and M3 series are premium ADAS-grade devices with broad OEM design wins; assertion against these products maximises commercial pressure. Any competitor designing automotive SoCs with similar architectural features — particularly in the ADAS, instrument cluster, or in-vehicle infotainment space — should treat these four patents as active risk vectors requiring FTO evaluation.
Should your automotive SoC or MCU design be cleared against these four patents?
If your team is developing or integrating automotive-grade SoCs, ADAS processors, or embedded MCUs in product categories adjacent to Renesas’s R-Car or RZ/G families, these four patents — US8117479B2, US10162642B2, US7038695B2, and US8643659B1 — warrant FTO review. The breadth of accused products in this case (25+ SKUs across multiple families) suggests the asserted claims were written or interpreted broadly enough to reach diverse implementations. Ignoring these patents in your clearance workflow carries material commercial risk, particularly for designs targeting US automotive OEMs.
PatSnap Eureka’s FTO Search Agent can map the claim scope of all four patents against your product architecture, identify relevant prior art that may narrow enforceability, and flag continuation or divisional filings in Xueshan’s portfolio that could generate future assertions. Claim monitoring alerts will notify your IP team if Xueshan — or any assignee — files new continuations or related applications, giving you early warning before a new assertion materialises. Start your FTO workflow directly from the patent numbers above.
Run a freedom-to-operate analysis on US8117479B2 to assess your product’s exposure
Run FTO in Eureka →Similar automotive SoC and MCU patent infringement cases in E.D. Texas
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What this case signals for the automotive semiconductor IP landscape
Four patents, 25+ accused products, and a private exit — this case reflects recurring dynamics in automotive SoC IP enforcement.
Automotive SoC portfolios are high-value litigation targets
Renesas’s R-Car and RZ/G product families power safety-critical automotive and industrial systems globally. Asserting four patents across 25+ SKUs maximises leverage by threatening an entire product ecosystem rather than a single device. Companies with broad SoC portfolios should treat semiconductor architecture patents as a material IP risk, not merely a peripheral concern.
E.D. Texas remains a preferred venue for semiconductor IP plaintiffs
The Eastern District of Texas continues to attract patent infringement filings in the semiconductor space due to its established patent litigation procedures and plaintiff-friendly reputation. Defendants with significant US market exposure — particularly in automotive-grade chips — should factor venue risk into their FTO and IP risk assessments when entering or expanding in the US market.
Xueshan v Renesas — key questions answered
The case was dismissed with prejudice. On 15 February 2024, the Eastern District of Texas accepted the parties’ Joint Stipulation of Dismissal, ordering that all claims and causes of action in Case No. 2:22-cv-00157 are dismissed with prejudice. Xueshan Technologies is permanently barred from re-asserting the same four patents against the same Renesas products.
Xueshan asserted four US patents: US8117479B2 (App. No. 12/402698), US10162642B2 (App. No. 14/172839), US7038695B2 (App. No. 10/812173), and US8643659B1 (App. No. 10/958758). All four were asserted in a single complaint filed in the Eastern District of Texas on 17 May 2022.
The accused products include Renesas’s R-Car automotive SoC family (R-Car H2, H3, H3Ne, H3e, M2, M3, M3Ne, M3e, V3U, V2H, D1, D3, D3e, E2, E3e), the RZ/G MPU family (RZ/G1H, RZ/G1C, RZ/G1E, RZ/G1M, RZ/G1N, RZ/G2E, RZ/G2H, RZ/G2M, RZ/G2N), and Renesas Synergy S5 and S7 Series MCUs — over 25 distinct product SKUs in total.
No substantive rulings on validity, infringement, or claim construction are visible in the public record. The case resolved via joint stipulation before any merits adjudication. The court’s order explicitly denied all pending relief as moot, confirming that no outstanding motions received substantive rulings at the time of dismissal.
Xueshan Technologies was represented by Nelson Bumgardner Conroy PC (with additional support from Warren Rhoades, LLP), with lead attorneys including Edward R. Nelson III, Patrick Joseph Conroy, and Jonathan Hart Rastegar. Renesas Electronics was represented by Gillam & Smith LLP, with Melissa Richards Smith listed as lead counsel for the defence.
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