Mimzi, LLC v. Hyundai Motor Company

This lawsuit is a notable example of a non-practicing entity (NPE) campaign targeting the automotive industry's connected-car technology. The plaintiff, Mimzi, LLC, is an entity that enforces patents rather than developing or selling products. It has sued Hyundai Motor Company, a major global automaker, alleging that its vehicles equipped with infotainment systems that integrate with platforms like Apple CarPlay infringe Mimzi's patent. The accused technology involves features that allow drivers to use voice commands to interact with their devices for communication and control, which Mimzi claims are covered by its intellectual property. This suit is one of several similar cases Mimzi filed concurrently against other automakers, including Nissan, Ford, Mercedes-Benz, and Subaru, asserting the same patent.

The single patent-in-suit is U.S. Patent No. 9,792,361, which generally describes a system for using a phone to record audio from calls or dictation and storing the audio, metadata, and speech-recognized text in a centralized, searchable repository. The case was filed in the U.S. District Court for the Eastern District of Texas and assigned to Chief Judge Rodney Gilstrap, the nation's busiest patent judge. This venue is historically favored by patent plaintiffs, particularly NPEs, for its experienced judiciary and case management procedures tailored to patent disputes. The high volume of patent cases before Judge Gilstrap and in the district makes it a significant battleground for intellectual property rights.

The case is significant not only as part of a multi-front litigation campaign against the auto industry but also due to a parallel challenge to the patent's validity. In late 2025, the patent-defense organization Unified Patents filed a request for ex parte reexamination of the '361 patent. On December 4, 2025, the U.S. Patent and Trademark Office's Central Reexamination Unit granted the request, finding "substantial new questions of patentability" regarding the patent's claims. This development cast significant doubt on the patent's strength and likely influenced the district court proceedings. The cases against Hyundai and other automakers, which had been consolidated for pretrial matters, were short-lived. On January 8, 2026, Mimzi voluntarily dismissed its case against Hyundai with prejudice, precluding it from re-filing the same claim. This swift conclusion, following the initiation of the USPTO reexamination, suggests the parties may have reached a settlement or that Mimzi opted to end its campaign in light of the validity challenge.

Key Legal Developments and Outcome

The patent infringement lawsuit between Mimzi, LLC and Hyundai Motor Company was a short-lived case that ended in an early, voluntary dismissal by the plaintiff. The case was part of a broader litigation campaign by Mimzi against several automakers, which was consolidated and ultimately terminated in early 2026. A parallel challenge to the validity of the asserted patent at the U.S. Patent and Trademark Office appears to have been a significant factor in the case's resolution.

Filing and Initial Pleadings (2025)

• 2025-06-04: Mimzi, LLC filed a complaint for patent infringement against Hyundai Motor Company in the U.S. District Court for the Eastern District of Texas, alleging infringement of U.S. Patent No. 9,792,361. The case was assigned to Judge Rodney Gilstrap. This lawsuit was one of several similar cases filed by Mimzi on the same day against other automotive companies, including Honda, Nissan, and Subaru.
• 2025-07-10: A waiver of service was executed for Hyundai, indicating the defendant had formally received the complaint.
• 2025-10-06: The court granted Hyundai an extension of time to file its answer to the complaint, with a new deadline of November 5, 2025. However, no answer or counterclaims from Hyundai appear on the public docket before the case was terminated.

Consolidation and Parallel PTAB Proceeding (2025)

• 2025-10-23: Magistrate Judge Roy S. Payne ordered the consolidation of the case against Hyundai with several other cases filed by Mimzi for all pretrial matters. The lead case was designated as Mimzi, LLC v. Subaru Corp., No. 2:25-cv-00602.
• 2025-10-29: In a significant parallel development, Unified Patents filed a request for an ex parte reexamination of the asserted '361 patent with the U.S. Patent and Trademark Office (USPTO). This challenge argued that the patent claims were invalid based on prior art. The timing of this filing, shortly after the district court cases were consolidated, is notable and likely influenced Mimzi's litigation strategy.

Dismissal and Final Outcome (2026)

The case did not proceed to any substantive motions, claim construction, or discovery milestones.

• 2026-01-08: Judge Rodney Gilstrap issued an order dismissing the case against Hyundai. This order was entered after Mimzi filed a "Notice of Voluntary Dismissal" in the lead consolidated case (2:25-cv-00602).
• Terms of Dismissal: Analysis of a parallel, consolidated case against Honda indicates that Mimzi's dismissal was filed pursuant to Federal Rule of Civil Procedure 41(a)(1)(A)(i). This rule allows a plaintiff to unilaterally dismiss a case before the opposing party files an answer or a motion for summary judgment. The dismissal was without prejudice, meaning Mimzi retains the right to refile the lawsuit against Hyundai on the same patent in the future. Each party was to bear its own costs and attorneys' fees. Given the identical procedural posture, the dismissal against Hyundai was almost certainly on the same terms.

Present Posture

As of today's date, the litigation is closed. The voluntary dismissal without prejudice, coming shortly after the patent was challenged in a USPTO reexamination, suggests a strategic retreat by Mimzi. The company may be waiting to see the outcome of the reexamination before deciding whether to re-assert the patent. The status of the ex parte reexamination of U.S. Patent No. 9,792,361 remains pending at the USPTO and its outcome will be critical to the patent's future enforceability.

Plaintiff's Counsel of Record Identified in Mimzi v. Hyundai Patent Case

Updated: 2026-05-09

Attorneys from the Georgia-based intellectual property boutique Kent & Risley LLC have been identified as lead counsel for Mimzi, LLC in its patent infringement lawsuit against Hyundai Motor Company in the U.S. District Court for the Eastern District of Texas. While the case was active, docket entries and filings in related consolidated cases revealed the plaintiff's legal team. The case against Hyundai was voluntarily dismissed on January 8, 2026.

The known counsel for Plaintiff Mimzi, LLC are as follows:

Lead Counsel

• Name: Cortney S. Alexander

  • Role: Lead Counsel
  • Firm: Kent & Risley LLC (Alpharetta, Georgia)
  • Note: A partner at the firm since 2017, Alexander has nearly two decades of experience in intellectual property litigation, with a focus on enforcing patent rights in federal courts and before the Patent Trial and Appeal Board (PTAB).

• Name: Daniel A. Kent

  • Role: Lead Counsel
  • Firm: Kent & Risley LLC (Alpharetta, Georgia)
  • Note: Kent is a founding partner of the specialty litigation firm and has extensive experience successfully representing clients from individual inventors to Fortune 50 companies in complex intellectual property disputes.

Local Counsel

No local counsel for Mimzi, LLC has been explicitly identified on the publicly available docket summary for the Hyundai case (2:25-cv-00599). Patent infringement cases filed in the Eastern District of Texas typically require the association of local counsel. Given that the case was part of a multi-defendant litigation campaign managed by the same lead counsel and was dismissed relatively early, it is probable that local counsel was retained, but may not have filed separate appearances in each individual case before consolidation and subsequent dismissal. Filings were often made in the lead consolidated case.

The lawsuit, filed on June 4, 2025, accused Hyundai vehicles equipped with certain infotainment and connectivity features of infringing U.S. Patent No. 9,792,361, which relates to a "photographic memory" system. The case was part of a broader litigation campaign by Mimzi, which filed similar suits against other major automakers, including Nissan, Ford, Mercedes-Benz, Honda, and Subaru on the same day.

The case against Hyundai was consolidated for pretrial proceedings with Mimzi LLC v. Subaru Corp., No. 2:25-cv-00602, before being voluntarily dismissed by Mimzi. In parallel proceedings, the patent-at-issue, U.S. Patent 9,792,361, was the subject of an ex parte reexamination proceeding filed by Unified Patents in October 2025. Several of the related cases were stayed pending the outcome of these reexaminations before Mimzi ultimately dismissed its claims against Hyundai, Honda, and Nissan.

As of the present date, attorneys from O'Melveny & Myers LLP and Gillam & Smith LLP have appeared on behalf of defendant Hyundai Motor Company in the Mimzi, LLC v. Hyundai Motor Company patent infringement case.

Based on news reports and professional attorney profiles, the counsel of record are as follows:

Lead Counsel

• Name: Ryan K. Yagura

  • Role: Lead Counsel
  • Firm: O'Melveny & Myers LLP, Los Angeles, CA
  • Note: As Chair of his firm's Intellectual Property and Technology Practice, he has a significant track record leading patent litigation for major global technology companies, including Hyundai.

• Name: D. Sean Trainor

  • Role: Lead Counsel
  • Firm: O'Melveny & Myers LLP, Washington, D.C.
  • Note: A seasoned intellectual property litigator with deep experience in Section 337 investigations before the International Trade Commission (ITC) across a wide array of technologies.

• Name: Nicholas J. Whilt

  • Role: Counsel
  • Firm: O'Melveny & Myers LLP, Los Angeles, CA
  • Note: Represents clients in high-stakes intellectual property litigation with a background in computer science and experience in cases involving semiconductors, processors, and memory.

• Name: Nancy L. Schroeder

  • Role: Counsel
  • Firm: O'Melveny & Myers LLP, Los Angeles, CA
  • Note: An intellectual property litigator with a focus on complex patent and trade secret litigation involving technologies from semiconductors to medical devices.

Local Counsel

• Name: Melissa Richards Smith
  • Role: Local Counsel
  • Firm: Gillam & Smith LLP, Marshall, TX
  • Note: A highly experienced and respected East Texas trial attorney, she has served as local counsel in over three thousand patent cases in the district.