Patent 11991601

Litigation summary

Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.

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PTAB activity (1)

AIA trial proceedings — IPR, PGR, CBM — filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced directly from the PTAB Trial API.

  • IPR2026-00107IPRfiled Oct 31, 2025vs. Apple Inc.Institution Denied

Cached for 24 hours. Status strings are sourced verbatim from the PTAB API; the colored badge is our heuristic classification.

Cases on file (2)

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Specific litigation cases in our database that name US patent 11991601. The free-form analysis below may also discuss cases beyond this list.

  • HBCU Messaging US LP v. Apple, Inc. et al.
    1:24-cv-01199U.S. District Court for the Western District of Texasactive

    Defendants: Apple, Inc. and Green Dot Corporation

  • Untitled case
    IPR2026-00107Patent Trial and Appeal Board (PTAB)pending

    Defendants: Rembrandt Messaging Technologies LP

Litigation summary

Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.

✓ Generated

Litigation Involving US Patent 11,991,601

As of April 26, 2026, US Patent 11,991,601 is involved in at least two legal proceedings: a district court case and a post-grant proceeding before the Patent Trial and Appeal Board (PTAB).

District Court Litigation

Case Title: HBCU Messaging US LP v. Apple, Inc. and Green Dot Corp.

  • Plaintiff: HBCU Messaging US LP (formerly Rembrandt Messaging Technologies II, LP)
  • Defendants: Apple, Inc. and Green Dot Corporation
  • Jurisdiction: U.S. District Court for the Western District of Texas
  • Case Number: 1:24-cv-01199
  • Filing Date: The case was filed in the latter half of 2024, with reports on the filing emerging in October 2024 and January 2025.
  • Outcome or Current Status: The case is currently active and ongoing. As of late 2025, the parties have been engaged in claim construction proceedings. The lawsuit alleges that Apple's Cash service, Messages app, and supporting hardware infringe on seven mobile messaging patents, including the '601 patent. The plaintiff is a subsidiary of the HBCU Technology Foundation.

Patent Trial and Appeal Board (PTAB) Proceeding

  • Case Number: IPR2026-00107
  • Plaintiff/Petitioner: Information regarding the petitioner is not publicly available in the search results.
  • Defendant/Patent Owner: Rembrandt Messaging Technologies LP
  • Filing Date: The filing date has not been publicly disclosed in the searched records.
  • Outcome or Current Status: The case is currently pending before the PTAB.

Further details regarding the petitioner and the specific claims being challenged in IPR2026-00107 are not available in the public records searched.

Generated 5/13/2026, 12:32:30 AM