Marlin Semiconductor Limited et al. v. Lenovo et al.

Marlin Semiconductor Limited and Longitude Licensing Limited, both Irish entities and subsidiaries of the patent monetization firm IPValue Management Group, initiated this patent infringement lawsuit in the Eastern District of Texas. As Non-Practicing Entities (NPEs), the plaintiffs derive their revenue from licensing and asserting intellectual property, having acquired the patents-in-suit from United Microelectronics Corporation (UMC). The defendants are major global technology companies: Lenovo, a multinational specializing in consumer electronics like PCs and smartphones; OnePlus, a Chinese consumer electronics manufacturer known for its smartphones; and Taiwan Semiconductor Manufacturing Company Limited (TSMC), the world's largest dedicated independent semiconductor foundry. The accused technology involves "non-x86 semiconductor devices," specifically semiconductor wafers or dies manufactured using TSMC's 16nm and smaller process nodes, as well as downstream products such as desktop computers, smartphones, smartwatches, tablets, and wearables that incorporate these semiconductor devices.

The litigation, filed as 2:25-cv-00171, is before Judge James R. Gilstrap in the Eastern District of Texas. This venue is historically significant for patent plaintiffs due to its reputation as a "rocket docket" with accelerated trial schedules and procedural rules often considered favorable to patent holders. Following the TC Heartland Supreme Court decision, which restricted patent venue, plaintiffs have adapted by targeting foreign affiliates, such as TSMC, Lenovo, and OnePlus, to leverage general venue rules applicable to foreign defendants.

While the case metadata identified patent US8993384, legal news sources specifically reporting on this case and a related International Trade Commission (ITC) complaint (337-TA-3809) indicate that five UMC-originated patents are at issue: US7,745,847, US9,093,473, US9,147,747, US9,184,292, and US9,953,880, all broadly relating to semiconductor fabrication. For instance, US9,147,747 covers aspects of MOS transistor technology, with prior art discussing raised epitaxial layers. This case is notable for several reasons, including the aggressive assertion patterns of IPValue Management's NPEs against prominent technology companies in the semiconductor and consumer electronics industries. Furthermore, both TSMC and Apple have challenged at least one of the asserted patents (US9,147,747) through inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB), signaling a robust validity challenge in parallel with the district court action. The case is part of a broader enforcement strategy, including a parallel district court case in the Western District of Texas and an ITC complaint against the same set of defendants.

Here's a summary of the key legal developments and outcome for Marlin Semiconductor Limited et al. v. Lenovo et al., case number 2:25-cv-00171, in the Eastern District of Texas, as of May 21, 2026:

1. Filing & Initial Pleadings

• Complaint Filed: On February 13, 2025, plaintiffs Longitude Licensing Limited and Marlin Semiconductor Limited filed a complaint for patent infringement against Lenovo Group Limited, Motorola (Wuhan) Mobility Technologies Communication Company Limited, Motorola Mobile Communication Technology Ltd., OnePlus Technology (Shenzhen) Co., Ltd., and Taiwan Semiconductor Manufacturing Company Limited (TSMC) in the Eastern District of Texas. The lawsuit alleges infringement of patents, including US8993384, related to semiconductor fabrication. The defendants are accused of infringement through semiconductor devices fabricated using TSMC's 16nm and smaller process nodes, and downstream products incorporating these devices, such as desktop computers, smartphones, and tablets.
• Related ITC Complaint: A parallel Section 337 investigation, Certain Foreign-Fabricated Semiconductor Devices, Products Containing the Same, and Components Thereof (Inv. No. 337-TA-1443), was instituted by the U.S. International Trade Commission (USITC) on March 26, 2025. This ITC complaint, also filed by Longitude Licensing Ltd. and Marlin Semiconductor Limited, asserted U.S. Patent Nos. 7,745,847; 9,093,473; 9,147,747; 9,184,292; and 9,953,880 against several respondents including Apple, Broadcom, Qualcomm, Lenovo, Motorola, OnePlus, and TSMC.

2. Pre-trial Motions of Substance

• ITC Respondent Changes (August 19, 2025): The USITC determined not to review an Initial Determination (Order No. 34) which granted an unopposed motion to substitute specific Lenovo entities (e.g., Lenovo (Shanghai) Electronics Technology Co., Ltd.) for Lenovo Group Ltd. and to terminate Lenovo Group Ltd. from the ITC investigation.
• PTAB IPR Discretionary Denials (September 3, 2025): The Director of the USPTO issued a discretionary denial of institution for several Inter Partes Review (IPR) petitions filed by TSMC and Apple against Marlin Semiconductor Ltd., specifically IPR2025-00848, IPR2025-00864 (challenging US9184292), IPR2025-00865, and IPR2025-00879. The denial was based on the "totality of the evidence and arguments," citing the significant duplication of effort, additional expense for the parties, and risk of inconsistent decisions given the earlier scheduled ITC hearing (February 2, 2026) compared to the projected IPR final written decision dates (November 15, 2026). However, institution for IPR2025-00847 (challenging US7745847) was not discretionarily denied.

3. Claim Construction (Markman) Outcomes

• No specific claim construction (Markman) outcomes have been publicly reported for the district court case as of the current date.

4. Discovery Milestones with Strategic Significance

• ITC Evidentiary Hearing Scheduled (February 2, 2026): An evidentiary hearing in the parallel ITC investigation (337-TA-1443) was scheduled for February 2, 2026.
• PTAB Deposition (May 14, 2026): In IPR2025-01265, which challenges U.S. Patent No. 8,993,384 B2, Taiwan Semiconductor Manufacturing Company Ltd. filed a notice on April 21, 2026, for the deposition of Mr. Joseph C. McAlexander III, scheduled for May 14, 2026.

5. Trial Events, Verdict, and Post-Trial Motions

• The district court litigation is ongoing, and no trial events, verdicts, or post-trial motions have been reported.

6. Settlement, Dismissal, Judgment, or Appeal

• The district court case (2:25-cv-00171) remains active and ongoing.
• Partial Termination of ITC Claims (December 15, 2025): The USITC determined not to review an Initial Determination (Order No. 47) which granted an unopposed motion from Complainants to partially terminate the ITC investigation as to certain claims of the asserted patents, based on the withdrawal of the complaint for those claims. This included claims from U.S. Patent Nos. 7,745,847, 9,093,473, 9,147,747, 9,184,292, and 9,953,880.

7. Parallel PTAB IPR/PGR Proceedings and their Effect

• IPR2025-00847 (U.S. Patent No. 7,745,847): Filed April 17, 2025, by TSMC and Apple Inc. against Marlin Semiconductor Ltd. Institution for this IPR was not discretionarily denied, meaning it is proceeding.
• IPR2025-00848, IPR2025-00864 (U.S. Patent No. 9,184,292), IPR2025-00865, IPR2025-00879: These IPRs, filed around April 2025 by TSMC and Apple Inc. against Marlin Semiconductor Ltd., were discretionarily denied institution by the USPTO Director on September 3, 2025. This denial was explicitly linked to the ongoing ITC investigation, aiming to avoid duplication and inconsistent outcomes.
• IPR2025-01082 (Application # 10/708,694): This IPR, involving Marlin Semiconductor Limited as the patent owner, resulted in a "Request For Adverse Judgment After Institution" decision on May 13, 2026.
• IPR2025-01265 (U.S. Patent No. 8,993,384): This IPR was filed on July 7, 2025, by Taiwan Semiconductor Manufacturing Company Ltd. against Marlin Semiconductor Ltd., directly challenging the patent specified in the district court case caption. Discovery, including a deposition, is ongoing in this IPR.

The plaintiffs, Marlin Semiconductor Limited and Longitude Licensing Limited, are represented by counsel from Mintz, Levin, Cohn, Ferris, Glovsky And Popeo, P.C..

Specific counsel identified from the initial case filings include:

• Andrea Fair
  • Role: Likely lead or primary counsel.
  • Firm: Mintz, Levin, Cohn, Ferris, Glovsky And Popeo, P.C.
  • Office Location: While specific office location for Ms. Fair in this context isn't detailed in the search results, Mintz Levin has multiple offices across the US, including relevant IP hubs. Further research would be needed to pinpoint her specific office.
  • Relevant Experience: Andrea Fair is noted on the PacerMonitor docket entry in connection with identifying corporate parent for the plaintiffs, indicating her involvement from the outset of the case. Her practice generally focuses on complex patent litigation.

The defendants in Marlin Semiconductor Limited et al. v. Lenovo et al. (2:25-cv-00171) are represented by several law firms. The case also has a related ITC investigation (337-TA-1443), which provides further insight into the legal teams involved.

Here's a breakdown of the identified counsel for the defendants:

For Lenovo:

• Firm: O'Melveny & Myers
  • Office Location: Specific office location for this case is not detailed in the search results, but O'Melveny & Myers has a strong patent litigation practice in various tech hubs.
  • Relevant Experience: O'Melveny & Myers represents Lenovo Group Limited and other related Lenovo entities in the parallel ITC investigation.
• Melissa Smith
  • Role: Counsel.
  • Firm: Not explicitly stated in the provided snippet, but she filed an unopposed motion for extension of time to file an answer for Lenovo Group Limited.

For OnePlus:

• Firm: Based on previous patent litigation involving OnePlus in the Eastern District of Texas, Leydig, Voit & Mayer Ltd. has represented OnePlus, with David Airan being a named attorney. Alston & Bird also represented OnePlus in a related mandamus petition.
  • David Airan
    • Role: Counsel.
    • Firm: Leydig, Voit & Mayer Ltd.
    • Relevant Experience: Represented OnePlus in a prior Eastern District of Texas patent case, Pantech Corp. et al. v. OnePlus Technology (Shenzhen) Co., Ltd., where a jury awarded Pantech over $10 million for infringement of 5G standard-essential patents.
  • Brady Randall Cox
    • Role: U.S. Counsel.
    • Firm: Alston & Bird.
    • Relevant Experience: Listed as U.S. counsel for OnePlus in a response to a petition for a writ of mandamus to the Federal Circuit related to an earlier Western District of Texas case.
  • Michael J Newton
    • Role: U.S. Counsel.
    • Firm: Alston & Bird.
    • Relevant Experience: Listed as U.S. counsel for OnePlus in a response to a petition for a writ of mandamus to the Federal Circuit.

For TSMC (Taiwan Semiconductor Manufacturing Company Limited):

• Firm: While specific counsel for the district court case is not explicitly detailed in the provided snippets, TSMC is actively involved in related Inter Partes Review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB) against Marlin Semiconductor.
  • Josephet al. Long (likely Joseph Long and team)
    • Role: Petitioner Counsel.
    • Firm: Not explicitly stated in the PTAB counsel list, but they are listed as petitioner counsel for TSMC in IPR2025-00847.
  • David et al. Cochran (likely David Cochran and team)
    • Role: Petitioner Counsel.
    • Firm: Not explicitly stated in the PTAB counsel list, but they are listed as petitioner counsel for TSMC in IPR2025-01265.

It is important to note that the Eastern District of Texas case (2:25-cv-00171) has seen unopposed motions for extension of time to answer the complaint for all defendants, and a scheduling/case management conference was set for May 28, 2025. There is also a mandatory stay in place for the district court action due to the parallel ITC investigation, which affects the proceedings.