Litigation involving US Patent 8667571

8667571

Headwater Research LLC v. Verizon Communications Inc. et al.

Verdict overturned

Docket:: 2:23-cv-00352
Court:: U.S. District Court for the Eastern District of Texas

π Headwater Research LLC Δ Verizon Communications Inc.Δ Cellco Partnership, d/b/a Verizon Wireless Δ Verizon Corporate Services Group Inc.

A jury found Verizon infringed and awarded $175 million in damages, but on April 24, 2026, a federal judge overturned the verdict, ruling that Headwater had improperly delayed filing the lawsuit.

Headwater Research LLC v. T-Mobile USA, Inc. et al.

Settled

Docket:: 2:23-cv-00377
Court:: U.S. District Court for the Eastern District of Texas

Patents:8667571

π Headwater Research LLC Δ T-Mobile USA, Inc.Δ Sprint LLC

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.

Settled

Docket:: 2:25-cv-00428
Court:: U.S. District Court for the Eastern District of Texas

Patents:8667571

π Headwater Research LLC Δ AT&T Inc.Δ its mobile subsidiaries

This lawsuit was filed in September 2023 and was settled before a jury trial was set to begin. The case was dismissed without prejudice.

Headwater Research LLC v. Apple Inc.

Settled

Court:: Western District of Texas

Patents:8667571

π Headwater Research LLC Δ Apple Inc.

This lawsuit alleged that Apple's products using the Apple Push Notification service infringed on Headwater's patents, including U.S. Patent No. 8,667,571. The case was settled and dismissed with prejudice 68 days after it was filed.