Uniloc v. Sony: 4-Patent Messaging Suit Dismissed With Prejudice After 7.5 Years
Uniloc Corp. and Uniloc Luxembourg S.A. filed suit against Sony in the Eastern District of Texas, asserting four wireless messaging patents against the PlayStation Messages app. After more than 2,700 days of litigation — consolidated with lead case 2:16-cv-00642 — all claims were dismissed with prejudice by joint stipulation, with each party bearing its own costs.
Seven-year consolidated messaging patent battle ends by joint stipulation
On 5 July 2016, Uniloc Corp. and Uniloc Luxembourg S.A. filed Case No. 2:16-cv-00732 in the Eastern District of Texas against Sony Corp., asserting infringement of four U.S. patents — US8243723B2, US8724622B2, US8995433B2, and US7535890B2 — covering wireless messaging and network session technologies. The accused product was Sony’s PlayStation Messages app. The case was consolidated with lead case 2:16-cv-00642-JRG before Chief Judge Rodney Gilstrap.
On 5 February 2024, the parties filed a Joint Stipulation of Voluntary Dismissal. The court accepted the stipulation and ordered all claims and causes of action in both the member case (2:16-cv-00732) and the lead case (2:16-cv-00642) dismissed with prejudice. Each party was ordered to bear its own costs, attorneys’ fees, and expenses. Dismissal with prejudice forecloses Uniloc from reasserting these specific claims against Sony on the same patents.
The case ran for approximately 2,771 days — an unusually extended lifecycle even by E.D. Texas standards, where complex patent matters typically resolve more quickly. The timing of the joint stipulation, arriving years after filing without a reported trial verdict, is consistent with a negotiated resolution or portfolio-level settlement, though the public record does not disclose financial terms. The simultaneous closure of both the member and lead cases suggests a comprehensive resolution across Uniloc’s broader Sony-targeting campaign.
Filing to dismissal in 2771 days
2,771 days — over 7.5 years, well above typical E.D. Texas patent case duration
All claims dismissed with prejudice; parties bear own costs
Joint Stipulation of Voluntary Dismissal — court-accepted
The dismissal was initiated by a Joint Stipulation (Dkt. No. 319) signed by both Uniloc entities and the named Sony defendants — PlayStation Mobile Inc. and Sony Interactive Entertainment LLC. Because the court formally accepted and acknowledged the stipulation, the dismissal carries judicial imprimatur and is binding. This mechanism is common when parties reach a private resolution but wish to avoid a formal settlement agreement appearing on the public docket.
Joint stipulation accepted by courtDismissal with prejudice bars Uniloc from refiling
A dismissal with prejudice operates as an adjudication on the merits. Uniloc Corp. and Uniloc Luxembourg S.A. are permanently barred from reasserting these four patents against Sony’s PlayStation Messages app in a new action. This is the strongest form of dismissal for a defendant — Sony obtains finality without a trial. Contrast with dismissal without prejudice, which would leave Uniloc free to refile.
Permanent bar on refilingEach party bears own costs — no fee-shifting
The court’s order that each party bear its own costs, attorneys’ fees, and expenses is the standard term in voluntary dismissal stipulations and does not signal a winner. It forecloses any post-dismissal motion for attorneys’ fees under 35 U.S.C. § 285 or Rule 54(d). For Uniloc, it avoids a potentially large fee award; for Sony, it means no cost recovery despite years of defence spending.
No fee-shifting, no § 285 awardLead case 2:16-cv-00642 also closed simultaneously
Case 2:16-cv-00732 was a member case consolidated under lead docket 2:16-cv-00642-JRG. The stipulation resolved both cases in a single order, with the clerk directed to close both dockets. This indicates the resolution was portfolio-wide rather than case-specific, suggesting any underlying agreement addressed Uniloc’s entire assertive campaign against Sony in this consolidated proceeding.
Portfolio-level resolution signalFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Uniloc, Corp. | Company | Patent licensing entity — holder of US8243723B2 and three related wireless messaging patentsSearch in Eureka ↗ |
| Defendant | Sony, Corp. | Company | Sony Corp. — global electronics and entertainment company, maker of PlayStation platformsSearch in Eureka ↗ |
| Plaintiff counsel | Aaron Seth Jacobs | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Charles Craig Tadlock | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Daniel James McGonagle | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Dean G. Bostock | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Jason Clarence Williams | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Keith Bryan Smiley | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Kevin Gannon | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Michael James Ercolini | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Paul J. Hayes | Attorney | Counsel for Uniloc, Corp.Search in Eureka ↗ |
| Defendant counsel | Abran James Kean | Attorney | Counsel for Sony, Corp.Search in Eureka ↗ |
| Defendant counsel | Eric Allan Buresh | Attorney | Counsel for Sony, Corp.Search in Eureka ↗ |
| Presiding judge | Judge Rodney Gilstrap | Chief Judge | Texas Eastern District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The court’s order accepts a joint stipulation rather than adjudicating any substantive claim. The phrase ‘dismissed with prejudice’ is legally significant: it forecloses Uniloc from relitigating these specific claims against Sony’s PlayStation entities. However, the order makes no finding on patent validity, claim construction, or infringement — meaning the four asserted patents remain in force and unchallenged on their merits. For third-party competitors in the gaming communications and messaging space, the order provides no invalidity shield.
US8243723B2 and three co-patents — wireless messaging & session management
The four patents asserted in this case — US8243723B2 (App. No. 12/398063), US8724622B2 (App. No. 13/546673), US8995433B2 (App. No. 14/224125), and US7535890B2 (App. No. 10/740030) — collectively cover wireless messaging architectures, network session management, and communication protocol methods. Held by Uniloc Luxembourg S.A. and Uniloc Corp., these patents were applied against Sony’s PlayStation Messages app, a real-time messaging platform embedded in Sony’s gaming ecosystem. The application numbers span multiple filing generations, suggesting a family-based assertion strategy.
Uniloc has historically deployed overlapping patent families across multiple defendants in the gaming, mobile, and enterprise communications sectors. The breadth of the asserted claims — spanning session initiation, message routing, and protocol handling — positions these patents as relevant to any company operating cloud-based or app-embedded messaging at scale. Despite the dismissal, these patents were never invalidated by this court, meaning they remain active enforcement instruments in Uniloc’s portfolio and present residual risk to competitors in the gaming communications space.
Should your team run an FTO check against US8243723B2 and co-patents?
Any company developing or operating a messaging feature embedded in a gaming platform, mobile application, or cross-platform communication service should treat these four Uniloc patents as live risk. The dismissal in this case does not constitute an invalidity finding — Sony obtained finality for itself, but the patents remain in force. Product teams building real-time messaging, push notification systems, or session-layer communication features are within the plausible scope of these claims and should not assume immunity based on this outcome.
PatSnap Eureka’s FTO Search Agent allows IP and R&D teams to map product architectures against the independent and dependent claims of US8243723B2, US8724622B2, US8995433B2, and US7535890B2 in structured, auditable outputs. Claim monitoring alerts can flag any continuation filings, reissue applications, or related assertions that Uniloc may pursue in subsequent campaigns — giving in-house teams early warning before a complaint lands.
Run a freedom-to-operate analysis on US8243723B2 to assess your product’s exposure
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What this case signals for the messaging-tech IP enforcement landscape
A 7.5-year patent campaign ending by joint stipulation raises pointed questions about PAE strategy, defensive depth, and the costs of prolonged Eastern District litigation.
Prolonged E.D. Texas cases increasingly resolve without trial verdicts
This case ran nearly 2,771 days before joint dismissal — far exceeding typical first-instance timelines. The pattern is consistent with a litigation strategy designed to impose costs on defendants until a negotiated exit becomes attractive. IP teams defending against similarly structured PAE campaigns should assess early exit strategies versus the full cost of defence through trial.
Dismissal with prejudice protects Sony but reveals no claim validity ruling
The four Uniloc patents — US8243723B2, US8724622B2, US8995433B2, and US7535890B2 — were never adjudicated on their merits in this case. Third parties in the messaging and gaming communication space cannot rely on this dismissal as proof of invalidity or non-infringement. Independent FTO analysis against these patents remains advisable.
Uniloc v Sony — key questions answered
All claims in Case No. 2:16-cv-00732 were dismissed with prejudice on 5 February 2024 pursuant to a Joint Stipulation of Voluntary Dismissal. The court also closed the lead consolidated case 2:16-cv-00642. Each party was ordered to bear its own costs and attorneys’ fees. No infringement or validity findings were made.
Uniloc asserted four patents: US8243723B2, US8724622B2, US8995433B2, and US7535890B2. These patents cover wireless messaging session management and network communication methods. They were directed at Sony’s PlayStation Messages app. None of the patents were adjudicated on validity or infringement before dismissal.
No. A dismissal with prejudice bars Uniloc from reasserting these claims against Sony but makes no finding on patent validity or infringement. The four patents remain in force and have not been ruled invalid by any court in this proceeding. Third parties cannot rely on this dismissal as an invalidity shield.
The case ran 2,771 days from filing in July 2016 to closure in February 2024. The public record does not disclose the specific reasons for the extended timeline. Cases of this duration in E.D. Texas are consistent with complex multi-patent disputes, procedural consolidation, and — in cases involving PAE plaintiffs — protracted negotiation periods before a privately negotiated resolution.
The court ordered each party to bear its own costs, attorneys’ fees, and expenses. This is standard in voluntary dismissal stipulations and precludes any subsequent fee-shifting motion under 35 U.S.C. § 285. It does not indicate who ‘won’ — Sony receives no cost reimbursement despite its years of defence expenditure, and Uniloc avoids any fee award that a prevailing defendant might otherwise seek.
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