Light Guide Innovations, LLC v. Walmart Inc.

Light Guide Innovations, LLC, identified as a Non-Practicing Entity (NPE) and an entity of Anjay Venture Partners LLC, has brought a patent infringement lawsuit against retail giant Walmart Inc. in the U.S. District Court for the Eastern District of Texas. The lawsuit, filed on March 21, 2025, alleges that Walmart infringes its patents through the sale of various VIZIO televisions, including Quantum, Quantum Pro, 4k, Full HD, HD, M-Series, V-Series, and D-Series models. The core of the alleged infringement lies in the LED strips used for television or other display backlighting within these accused products. The asserted patent at issue is US Patent 8,267,537, which generally describes a light-emitting apparatus designed to provide uniform illumination, typically relevant for display backlighting.

The case, assigned number 2:25-cv-00312, is currently pending in the Eastern District of Texas, a venue historically favored by patent plaintiffs, particularly NPEs, due to its reputation for a quick path to trial, plaintiff-friendly juries, and judges with extensive experience in patent litigation. District Judge Robert W. Schroeder, III and Magistrate Judge Roy S. Payne are overseeing the proceedings. Upcoming events on the docket include a Claim Construction Hearing scheduled for August 14, 2026, and a Case Management Conference on January 12, 2027.

This litigation is notable as part of a broader assertion campaign by Light Guide Innovations, which has also filed similar lawsuits against other major display manufacturers and sellers like TCL, Hisense, and Samsung, all asserting patents from a portfolio originating from Suzhou Lekin Semiconductor Co. Ltd. (d/b/a LEKIN). The systematic targeting of prominent retailers and manufacturers of televisions underscores a strategic monetization effort in the consumer electronics market, specifically concerning display backlighting technology. While not directly related to the '537 patent, Unified Patents has challenged another patent from Light Guide Innovations' portfolio (US Patent 9,638,378), also related to backlight technology and asserted against Walmart and others, indicating scrutiny of the asserted patents' validity.

Key Legal Developments and Outcome in Light Guide Innovations, LLC v. Walmart Inc.

Case Number: 2:25-cv-00312-RWS-RSP
Court: U.S. District Court for the Eastern District of Texas
Status: Pending

This patent infringement lawsuit, filed by Light Guide Innovations, LLC against Walmart Inc., is currently pending in the Eastern District of Texas. It has been designated as a lead case for consolidated pretrial proceedings involving other defendants. The asserted patent is U.S. Patent No. 8,267,537, among others.

Chronological Legal Developments:

1. Filing & Initial Pleadings:

• 2025-03-21: Light Guide Innovations, LLC filed the initial Complaint for Patent Infringement against Walmart Inc. in the Eastern District of Texas. The complaint asserted 16 patents from the former Suzhou Lekin Semiconductor Co. Ltd. (d/b/a LEKIN) portfolio, including U.S. Patent No. 8,267,537. The plaintiff targets Walmart's provision of VIZIO televisions.
• 2025-03-31: Walmart Inc. was served with the summons.
• 2025-04-10: Light Guide Innovations LLC filed an unopposed application for an extension of time for Walmart to answer the complaint, setting a new answer date of June 5, 2025.
• 2025-06-16: Light Guide Innovations LLC filed its First Amended Complaint for Patent Infringement.
• 2025-06-26: Walmart Inc. filed a Partial Motion to Dismiss Plaintiff's First Amended Complaint for Failure to State a Claim.
• 2025-07-22: Light Guide Innovations LLC filed a response in opposition to Walmart's partial motion to dismiss.
• 2025-07-24: Walmart Inc. filed a response in support of its partial motion to dismiss.

2. Pre-trial Motions of Substance:

• 2025-07-18: A Consolidation Order was issued sua sponte by the court, consolidating several cases for all pretrial issues (except venue) with Light Guide Innovations LLC v. Walmart Inc. (2:25-CV-00312-RWS-RSP) designated as the Lead Case. Member cases, such as Light Guide Innovations v. Hisense Co. (2:25-cv-00051-RWS-RSP), remain active for venue determinations and trial.
• 2025-07-18: An E-Discovery Order was signed by Magistrate Judge Roy S. Payne.
• 2025-08-01: Joint motions for entry of an Agreed Protective Order, Agreed Discovery Order, and Agreed Docket Control Order were filed by Light Guide Innovations LLC.
• 2025-08-03: A Docket Control Order was signed by Magistrate Judge Roy S. Payne.
• 2025-08-27: An Order granted a motion for extension of time to file a response/reply related to a sealed motion to dismiss for lack of personal jurisdiction, improper venue, and failure. (It is unclear if this sealed motion was filed by Walmart or another defendant in a consolidated case).

3. Claim Construction (Markman) Outcomes:

• 2026-08-14: A Markman Hearing is set to be held before Magistrate Judge Roy S. Payne.

4. Discovery Milestones:

• 2025-09-05: Walmart Inc. filed a Notice of Compliance for Service of its P.R. 3-3 and P.R. 3-4 Disclosures to Plaintiff Light Guide Innovations LLC.

5. Parallel PTAB IPR/PGR Proceedings:

• 2025-09-16: Hisense USA Corp. et al., a defendant in a member case consolidated with Light Guide Innovations LLC v. Walmart Inc., filed an IPR petition (IPR2025-01538) challenging U.S. Patent No. 8,267,537.
• 2025-11-20: The Patent Owner, Light Guide Innovations LLC, filed a Patent Owner's Request For Discretionary Denial of Institution in IPR2025-01538.
• 2025-12-04: Unified Patents filed an ex parte reexamination proceeding against U.S. Patent 9,638,378, another patent owned and asserted by Light Guide Innovations, LLC, which has been asserted against Walmart, TCL, Hisense, and Samsung.
• 2025-12-21: The Petitioner, Hisense USA Corp., filed an Opposition to Patent Owner's Request for Discretionary Denial of Institution in IPR2025-01538.
• 2026-01-15: The Patent Trial and Appeal Board (PTAB) issued a Director Discretionary Decision to Deny institution of IPR2025-01538 concerning U.S. Patent No. 8,267,537.

6. Present Posture:

• The case is active and proceeding through the pre-trial phase in the Eastern District of Texas.
• A Markman hearing is scheduled for August 14, 2026.
• Jury Selection is set for February 16, 2027, before District Judge Robert W. Schroeder III.
• The PTAB has denied institution of an IPR against the asserted patent 8,267,537, which removes a potential avenue for invalidating the patent outside of district court litigation.

Here is the identified counsel of record representing Light Guide Innovations, LLC in Light Guide Innovations, LLC v. Walmart Inc., Case No. 2:25-cv-00312-RWS-RSP in the Eastern District of Texas:

• Name: Justin Kurt Truelove

  • Role: Counsel for Plaintiff
  • Firm: Not explicitly stated in the provided search results for this case.
  • Office Location: Not explicitly stated in the provided search results for this case.
  • Experience Note: Justin Kurt Truelove filed a Notice of Attorney Appearance on behalf of Light Guide Innovations LLC on July 14, 2025.

• Name: Vincent J. Rubino, III

  • Role: Counsel for Plaintiff
  • Firm: Fabricant, Rubino & Lambrianakos LLP (also listed as Fabricant Llp - Rye and Fabricant Llp - Ny)
  • Office Location: New York (Rye)
  • Experience Note: Vincent J. Rubino, III is listed as Respondent Counsel for Light Guide Innovations LLC in IPR2025-01538 concerning Patent No. 8267537, which is also at issue in the district court case. He is also listed as counsel for Light Guide Innovations LLC in other cases, including Light Guide Innovations LLC v. [Samsung Electronics Co. Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%20Ltd.) et al (2:25-cv-01093) and Light Guide Innovations LLC v. TCT Mobile International Limited et al (2:24-cv-00646) in the Eastern District of Texas.

An attorney named Jennifer Leigh Truelove is noted to have filed a Notice of Attorney Appearance for Light Guide Innovations LLC in a related case, Light Guide Innovations LLC v. TCT Mobile Intl Ltd, Case No. 2:24-cv-00646. However, the provided search results do not explicitly confirm her appearance as counsel in the Light Guide Innovations, LLC v. Walmart Inc. case (2:25-cv-00312).

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print(google_search.search(queries=["Light Guide Innovations, LLC v. Walmart Inc. 2:25-cv-00312-RWS-RSP defendant counsel", "Walmart Inc. patent litigation counsel", "PACER Light Guide Innovations, LLC v. Walmart Inc. 2:25-cv-00312-RWS-RSP docket", "Eastern District of Texas local counsel Walmart patent cases"]))
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The user is asking for the counsel of record representing the defendant, Walmart Inc., in the case Light Guide Innovations, LLC v. Walmart Inc., Case No. 2:25-cv-00312-RWS-RSP. I need to identify the attorneys, their roles, firms, office locations, and relevant experience, using web search. I will prioritize docket sheets and official court filings for accuracy.Here is the identified counsel of record representing Walmart Inc. in Light Guide Innovations, LLC v. Walmart Inc., Case No. 2:25-cv-00312-RWS-RSP in the Eastern District of Texas:

• Name: Hilary Preston
  • Role: Counsel for Defendant
  • Firm: Unspecified in the immediate docket entry.
  • Office Location: Unspecified in the immediate docket entry.
  • Experience Note: Hilary Preston filed a Notice of Compliance for Service of Walmart Inc.'s P.R. 3-3 and P.R. 3-4 Disclosures on September 5, 2025.

Further searches would be necessary to identify Ms. Preston's firm, office location, and specific patent litigation experience. The provided search results indicate her appearance on behalf of Walmart Inc. in this case.