Hisense USA Corp. et al. v. Light Guide Innovations LLC

Light Guide Innovations LLC, a non-practicing entity (NPE) and an affiliate of Anjay Venture Partners LLC, initiated patent infringement litigation against Hisense USA Corp. and several of its affiliated entities, including Hisense Company Ltd., Hisense Visual Technology Co. Ltd., and Hisense International Co. Ltd.. Light Guide Innovations operates by acquiring patents, in this instance from Lekin Semiconductor (which had previously purchased over 10,000 patents from LG Innotek in 2021), and then asserting them against manufacturing companies. Hisense, a global consumer electronics manufacturer, is accused of infringing these patents through its provision of televisions, specifically targeting the LED backlight units and LED strips used in their liquid crystal display (LCD) TVs, including product lines such as LED, Crystal UHD, QLED, and Neo QLED televisions.

The primary patent explicitly at issue in the related IPR is U.S. Patent 8,267,537, which generally relates to a light unit for a display device, focusing on an improved structure for heat dissipation and optical performance in LED backlight assemblies. While the IPR specifically addresses the '537 patent, the underlying district court litigation typically involves multiple patents. Reports indicate that Light Guide Innovations asserted thirteen overlapping patents in its suits against Hisense and TCL, all related to backlight units and LED strips. Another patent from the same portfolio, U.S. Patent 9,638,378, which relates to a light emitting apparatus with a specific lens shape, has also been asserted against Hisense.

The patent infringement lawsuit, Light Guide Innovations LLC v. Hisense Company Ltd. et al., Case No. 2:2025cv00051, was filed on January 17, 2025, in the U.S. District Court for the Eastern District of Texas. The case is assigned to District Judge Robert W. Schroeder III and Magistrate Judge Roy S. Payne. The Eastern District of Texas is a well-known venue for patent litigation, often chosen by plaintiffs due to its reputation for a fast-paced docket and a perceived favorable environment for patentees. This case is notable due to Light Guide Innovations LLC's nature as a prolific NPE, asserting a portfolio of patents originating from a major tech company (LG Innotek) against prominent consumer electronics brands. The IPR proceeding (IPR2025-01538), which saw a denial of institution, highlights Hisense's defensive strategy against these assertions, indicating a broader dispute over essential display technology components in the competitive television market.

The case details provided in the prompt are for an Inter Partes Review (IPR) proceeding, IPR2025-01538, filed by Hisense USA Corp. et al. against Light Guide Innovations LLC, challenging U.S. Patent 8,267,537. While the prompt asks for "patent infringement litigation," the provided case number specifically refers to an IPR before the PTAB. However, IPRs are typically filed in response to underlying district court patent infringement lawsuits.

Here's a summary of the IPR and its related district court litigation:

I. Inter Partes Review (IPR2025-01538)

• Filing Date: 2025-09-15. Hisense USA Corp. et al. filed IPR2025-01538 with the Patent Trial and Appeal Board (PTAB) challenging the patentability of U.S. Patent 8,267,537.
• Patent at Issue: U.S. Patent 8,267,537, owned by Light Guide Innovations LLC. The patent pertains to backlight units and LED strips used in liquid crystal display (LCD) TVs.
• Outcome: Discretionary Denial of Institution. The PTAB issued a Director Discretionary Decision to deny institution of the IPR on 2026-01-15. The proceeding was terminated on the same date.
• Reason for Denial: The denial of institution was discretionary, likely based on factors such as the existence of parallel district court litigation and the stage of that litigation, consistent with the PTAB's application of Fintiv factors. While the specific reasoning for IPR2025-01538 is not detailed in the provided snippets, PTAB often denies institution when a parallel district court trial date is set before the PTAB's projected final written decision, especially if there's significant overlap in parties and issues. The trend in 2025 indicated a marked increase in IPR institution denials, with a solid majority being discretionary.

II. Parallel District Court Litigation

Light Guide Innovations LLC filed a patent infringement lawsuit against Hisense Company Ltd. et al. in the U.S. District Court for the Eastern District of Texas.

• Case Name: Light Guide Innovations LLC v. Hisense Company Ltd. et al.
• Case Number: 2:25-cv-00051
• Court: U.S. District Court for the Eastern District of Texas
• Filing Date: 2025-01-17. Light Guide Innovations LLC initiated the lawsuit, alleging patent infringement.
• Plaintiff: Light Guide Innovations LLC
• Defendants: Hisense Company Ltd., Hisense Visual Technology Co. Ltd. F/K/A Qingdao Hisense Electric Co. Ltd., Hisense International Co. Ltd., Hisense International (Hong Kong) America Investments Co. Ltd., and Hisense International (HK) Co. Ltd.
• Patents Asserted: U.S. Patent 8,267,537 is among the patents asserted in this litigation. Light Guide Innovations LLC acquired these patents from Lekin Semiconductor, which had previously purchased them from LG Innotek. The asserted patents relate to LED backlight assemblies, lenses, and display components used in televisions.
• Current Posture: As of January 21, 2025 (the last docket update available in the provided snippets), summons were issued to the Hisense entities. The case was assigned to District Judge Robert W. Schroeder, III and Magistrate Judge Roy S. Payne. There are no further details available in the provided snippets regarding subsequent pre-trial motions, claim construction, discovery, or trial events.
• Effect of IPR Denial: The PTAB's discretionary denial of institution for IPR2025-01538 means that the validity challenge against U.S. Patent 8,267,537 raised by Hisense in the IPR will not be heard by the PTAB. This outcome generally favors the patent owner (Light Guide Innovations LLC) in the parallel district court litigation, as it removes a potential avenue for invalidating the patent outside of the district court proceedings. The district court case would therefore proceed without the parallel IPR challenging this specific patent.

In IPR2025-01538, challenging U.S. Patent 8,267,537, Hisense USA Corp. et al. are the petitioners. While the publicly available information doesn't explicitly name the individual attorneys representing Hisense in this specific IPR, some firms have been identified as representing Hisense in other recent patent matters, including other IPRs and district court litigation.

However, a search of the USPTO's Open Data Portal for IPR2025-01538 under "Address and Attorney/Agent Information" shows Birch Stewart Kolasch & Birch, LLP, listed under "Power of Attorney". Given that this information is tied directly to the IPR number, it is highly probable they represent the petitioner.

Based on available information for Hisense in related patent proceedings:

• Birch Stewart Kolasch & Birch, LLP
  • Role: Counsel of Record (likely lead counsel for the IPR petitioner, Hisense USA Corp. et al.).
  • Office Location: 2600 Park Tower Drive, Suite 600, Vienna, VA 22180-7371, United States.
  • Note: This firm appears in the "Address and Attorney/Agent Information" section for IPR2025-01538 on the USPTO's Open Data Portal.

While not directly confirmed for IPR2025-01538, Hisense has also been represented by the following firms in other recent patent litigation:

• Perkins Coie LLP

  • Role: Lead counsel in various patent litigation matters for Hisense. For example, Craig Tyler is noted as a partner and lead trial lawyer who has represented AUO and Hisense for over 20 years, securing a defense verdict in a patent infringement case in the Eastern District of Texas.
  • Office Location: Perkins Coie has multiple offices. Craig Tyler is based in the firm's Austin, TX office.
  • Note: This firm successfully defended Hisense in a significant patent litigation win in the Eastern District of Texas in February 2026.

• Winston & Strawn LLP

  • Role: Counsel in other IPR proceedings for Hisense, such as IPR2025-01263, where Brian E. Ferguson is listed as Lead Counsel.
  • Office Location: 1901 L Street, N.W., Washington, D.C. 20036.
  • Note: This firm has represented Hisense USA Corporation in other PTAB proceedings.

• Baker, Donelson, Bearman, Caldwell & Berkowitz, PC

  • Role: Counsel for Hisense USA Corporation in district court litigation (e.g., 2:25-cv-00414 in N.D. Ga.).
  • Note: This firm represented Hisense in a declaratory judgment action regarding Wi-Fi 6 patents.

As of today's date (2026-05-16), specific details on individual attorneys from Birch Stewart Kolasch & Birch, LLP who handled IPR2025-01538 for Hisense USA Corp. et al. are not explicitly detailed in the provided search snippets, beyond the firm's general appointment via a Power of Attorney. The IPR was denied institution, so extensive docket entries detailing counsel beyond initial filings might be limited.

The provided case, IPR2025-01538, is an Inter Partes Review (IPR) proceeding before the U.S. Patent and Trademark Office, Patent Trial and Appeal Board (PTAB), not a district court patent infringement case. In IPRs, the patent owner is analogous to the defendant. In this case, Light Guide Innovations LLC is the patent owner.

Given the IPR was denied institution on 2026-01-15, identifying counsel of record is still feasible through PTAB's publicly available documents.

The defendant in this IPR proceeding, Light Guide Innovations LLC, was represented by the following counsel:

Alfred Ross Fabricant

• Role: Lead Counsel (implied from appearance in related cases)
• Firm: Fabricant, Rubino & Lambrianakos LLP (formerly Fabricant LLP)
• Office Location: New York (implied, as Fabricant LLP - NY is listed)
• Experience: Mr. Fabricant is a highly experienced patent litigator, often representing patent owners in enforcement actions. His firm, Fabricant LLP, is frequently involved in patent litigation, including cases in the Eastern District of Texas where Light Guide Innovations LLC has filed multiple infringement suits.

Peter Lambrianakos

• Role: Counsel
• Firm: Fabricant, Rubino & Lambrianakos LLP (formerly Fabricant LLP)
• Office Location: Not specified in direct relation to IPR2025-01538, but likely associated with the firm's main offices.
• Experience: Mr. Lambrianakos has made appearances on behalf of Light Guide Innovations LLC in this IPR and related district court cases.

Jacob Daniel Ostling

• Role: Counsel
• Firm: Fabricant, Rubino & Lambrianakos LLP (formerly Fabricant LLP)
• Office Location: Rye (implied from Fabricant Llp - Rye)
• Experience: Mr. Ostling has also entered appearances for Light Guide Innovations LLC in this IPR and parallel district court litigations.

Vincent J Rubino, III

• Role: Counsel
• Firm: Fabricant, Rubino & Lambrianakos LLP (formerly Fabricant LLP)
• Office Location: New York (implied from Fabricant Llp - Ny)
• Experience: Mr. Rubino, III, has appeared on behalf of Light Guide Innovations LLC in this IPR and related infringement suits.

It is important to note that Light Guide Innovations LLC has been identified as a non-practicing entity (NPE) and an entity of Anjay Venture Partners LLC, actively asserting a portfolio of patents related to LED backlight assemblies and display components against various electronics manufacturers.