Patent 8667571
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.
- IPR2025-01571IPRfiled Oct 14, 2025vs. Apple Inc. et al.Discretionary Denial
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Cases on file (4)
Group view →Specific litigation cases in our database that name US patent 8667571. The free-form analysis below may also discuss cases beyond this list.
- 2:23-cv-00352U.S. District Court for the Eastern District of TexasVerdict overturned
Defendants: Verizon Communications Inc., Cellco Partnership, d/b/a Verizon Wireless, and Verizon Corporate Services Group Inc.
- 2:23-cv-00377U.S. District Court for the Eastern District of TexasSettled
Defendants: T-Mobile USA, Inc. and Sprint LLC
- 2:25-cv-00428U.S. District Court for the Eastern District of TexasSettled
Defendants: AT&T Inc. and its mobile subsidiaries
- Western District of TexasSettled
Defendants: Apple Inc.
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
As of my last update on May 12, 2026, U.S. Patent No. 8,667,571 has been involved in several litigation cases. The patent is owned by Headwater Research LLC, a patent licensing entity. Here is a summary of the known litigation:
Litigation Against Major Wireless Carriers:
Headwater Research LLC v. Verizon Communications Inc. et al.
- Plaintiff: Headwater Research LLC
- Defendants: Verizon Communications Inc., Cellco Partnership, d/b/a Verizon Wireless, Verizon Corporate Services Group Inc.
- Jurisdiction: U.S. District Court for the Eastern District of Texas
- Case Number: 2:23-cv-00352
- Filing Date: July 2023
- Status: A jury found that Verizon infringed on two of Headwater's patents and awarded $175 million in damages in July 2025. However, in a subsequent ruling on April 24, 2026, a federal judge in Texas overturned the verdict, stating that Headwater had improperly delayed filing the lawsuit to maximize potential damages.
Headwater Research LLC v. T-Mobile USA, Inc. et al.
- Plaintiff: Headwater Research LLC
- Defendants: T-Mobile USA, Inc. and Sprint LLC
- Jurisdiction: U.S. District Court for the Eastern District of Texas
- Case Number: 2:23-cv-00377
- Status: The case was dismissed with prejudice after 816 days of litigation, indicating a confidential settlement was reached.
Headwater Research LLC v. AT&T Inc. et al.
- Plaintiff: Headwater Research LLC
- Defendants: AT&T Inc. and its mobile subsidiaries
- Jurisdiction: U.S. District Court for the Eastern District of Texas
- Case Numbers: 2:25-cv-00428 and 2:25-cv-00464
- Filing Date: September 2023
- Status: The lawsuits were settled before a jury trial was set to begin. The cases were dismissed without prejudice, meaning Headwater could potentially refile the claims in the future.
Other Notable Litigation:
- Headwater Research LLC v. Apple Inc.: This case, filed in the Western District of Texas, involved two patents related to securely delivering data to end-user devices, including U.S. Patent No. 8,667,571. The lawsuit alleged that Apple's products using the Apple Push Notification service infringed on Headwater's patents. The case was quickly settled and dismissed with prejudice just 68 days after it was filed in August 2025.
- Headwater Research LLC v. Samsung Electronics Co.: While specific details about the patents involved in every case are not available in the search results, it's worth noting that Headwater Research has been in litigation with Samsung, which resulted in a $278.8 million jury verdict in favor of Headwater in April 2025. This verdict was in a separate case from the one against Verizon. The dispute was settled in September 2025.
Note: Headwater Research LLC has been actively asserting its patent portfolio, which is focused on mobile data management and security, against major players in the telecommunications and technology sectors.
Generated 5/12/2026, 11:43:19 PM