Federal Judge Bars Patent Enforcement Based on Six-Year Delay to Maximize Damages

MARSHALL, TX (LN) — A federal judge in the Eastern District of Texas on Wednesday barred enforcement of a $175 million jury verdict against Verizon, ruling that Headwater Research LLC implicitly waived its right to enforce two background-data patents by waiting six years to sue after its principal had already identified the infringement.

U.S. District Judge Rodney Gilstrap held a bench trial on February 4, 2026, to resolve Verizon's equitable defenses after a jury on July 23, 2025, found the telecom giant had willfully infringed U.S. Patent Nos. 8,589,541 and 9,215,613 and awarded $175 million in damages. The patents relate to background data technologies.

The timeline presented at trial showed that Headwater's principal, Dr. Gregory Raleigh, began investigating whether Verizon was infringing as early as 2017. Headwater's own theory of the case placed the start of infringement in February 2016. Yet Headwater did not file suit until July 28, 2023.

Gilstrap found the delay was calculated to maximize damages recovery. Had Headwater sued in 2017, it could have collected damages only from February 2016—less than two years. By waiting until 2023, Headwater captured the full six-year lookback period under 35 U.S.C. Section 286. According to the opinion, as a sophisticated patent-assertion entity, Headwater and Dr. Raleigh knew, or should have known, the obvious advantages of delaying suit. The court found that Headwater's delay in filing suit was directly attributable to maximizing the damages it could recover.

The relationship between the parties made the delay significant. Verizon first invested $1.75 million in Headwater in 2010 for a 10% equity stake and later invested an additional $30 million in Headwater's sister entity, ItsOn Inc., between 2015 and 2017. Verizon still holds an equity interest in Headwater today. Gilstrap found that while those investments did not create an affirmative duty to disclose potential infringement claims, they did make Verizon's belief that Headwater would not delay filing suit all the more reasonable.

Gilstrap rejected Verizon's equitable estoppel theory, finding that Headwater never made representations broad enough to support a reasonable inference it would never sue. A no-litigation representation in the 2015 investment agreement covered only pending or then-intended suits, not a permanent covenant not to sue. The 2016 agreement has been lost by both parties, and Verizon identified no similar clause in the 2017 agreement.

But on implied waiver, Gilstrap sided with Verizon. The court found that Headwater's six-year silence, after it had full knowledge of infringement, constituted conduct so inconsistent with an intent to enforce its rights as to induce a reasonable belief that such right had been relinquished, applying the standard from JumpSport, Inc. v. Acad., Ltd. Verizon, left in the dark, continued to infringe and was deprived of the opportunity to seek non-infringing alternatives while the damages clock, visible only to Headwater, continued to run.

Gilstrap also addressed the potential conflict with the Supreme Court's 2017 ruling in SCA Hygiene Products v. First Quality Baby Products, which barred laches as a defense to patent damages. He found SCA Hygiene inapplicable because his ruling goes to liability itself, not merely damages, and because both SCA Hygiene and Petrella v. Metro-Goldwyn-Mayer expressly preserved equitable defenses beyond laches.

The opinion closed with language reflecting Gilstrap's assessment of Headwater's conduct. Every law student, early on, learns the equitable concept of unclean hands. Having realized in 2017 that its patents were being infringed, Dr. Raleigh and his corporate entities consciously delayed litigation against Verizon purely to benefit themselves. Six years later, they sued Verizon and asserted that such infringement had been willfully undertaken. This is conduct done with unclean hands.

Dr. Raleigh had testified at the bench trial that Headwater did not have sufficient knowledge of infringement until 2023. Gilstrap stated he was unpersuaded by this testimony, citing his own assessment of witness credibility from both the jury trial and the bench trial.

The ruling leaves Headwater with nothing from a case in which a jury had already found willful infringement and awarded nine figures in damages—a result that turns entirely on the six years Headwater chose to wait before filing.