Patent 11991600

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.

  • IPR2026-00105IPRfiled Oct 31, 2025vs. Apple Inc.Institution Denied

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Cases on file (2)

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Specific litigation cases in our database that name US patent 11991600. The free-form analysis below may also discuss cases beyond this list.

Litigation summary

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

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Litigation History for US Patent 11,991,600

As of May 13, 2026, US Patent 11,991,600 is subject to litigation in both federal district court and before the Patent Trial and Appeal Board (PTAB).

District Court Litigation

  • Case Title: HBCU Messaging US LP v. Apple Inc.
  • Plaintiff: HBCU Messaging US LP
  • Defendant: Apple Inc.
  • Jurisdiction: U.S. District Court for the Western District of Texas
  • Case Number: 1:24-cv-01199
  • Filing Date: The case was filed recently, and proceedings are in the early stages.
  • Status: Pending. This is an active patent infringement lawsuit where the plaintiff alleges that the defendant's products or services, likely related to messaging applications (e.g., iMessage), infringe on the claims of the '600 patent.

Patent Trial and Appeal Board (PTAB) Proceeding

In response to the district court lawsuit, the defendant has challenged the validity of the patent.

  • Case Title: Apple Inc. v. HBCU Messaging US LP
  • Petitioner: Apple Inc.
  • Patent Owner: HBCU Messaging US LP
  • Jurisdiction: USPTO Patent Trial and Appeal Board
  • Case Number: IPR2026-00105
  • Filing Date: This Inter Partes Review (IPR) was recently filed.
  • Status: Pending. The PTAB has not yet decided whether to institute a trial. Apple, Inc. has petitioned the board to review the patentability of the claims of US 11,991,600, likely arguing that the invention was obvious or not novel in light of prior art that existed before the patent's priority date. The outcome of this proceeding could significantly impact the district court litigation.

Generated 5/13/2026, 12:45:51 AM