MARSHALL, TX (LN) — A federal judge in the Eastern District of Texas on April 22, 2026, barred enforcement of a $175 million jury verdict against Verizon, ruling that Headwater Research LLC's six-year delay in filing suit after it discovered infringement in 2017 amounted to implied waiver of its right to enforce the asserted patents.
U.S. District Judge Rodney Gilstrap, who presided over the July 23, 2025, jury trial that found Verizon willfully infringed two background-data patents and awarded the nine-figure sum, conducted a separate bench trial on February 4, 2026, to resolve Verizon's equitable defenses of estoppel and waiver. He sided with Verizon on implied waiver alone.
The patents at issue — U.S. Patent Nos. 8,589,541 and 9,215,613, both relating to background data technologies — issued in 2013 and 2015, respectively. Headwater sued Verizon on July 28, 2023, alleging infringement that it claimed began in February 2016.
The pivotal factual finding was that Headwater's principal, Dr. Gregory Raleigh, knew of Verizon's infringement as early as 2017 — not 2023, as Raleigh testified. Gilstrap was blunt about why he rejected that testimony: Headwater, as a sophisticated patent-assertion entity, stood to collect damages only from February 2016 through the date of suit if it filed in 2017, a window of less than two years. By waiting until July 2023, it captured the full six-year lookback period under 35 U.S.C. section 286.
As a sophisticated patent-assertion entity, Headwater and Dr. Raleigh knew, or should have known, the obvious advantages of delaying suit, Gilstrap wrote. The Court finds that Headwater's delay in filing suit is directly attributable to maximizing the damages it could recover.
The relationship between the parties made the delay more damning. Verizon first invested $1.75 million in Headwater in 2010 for a 10% equity stake and later poured an additional $30 million into Headwater's sister entity, ItsOn Inc., between 2015 and 2017. 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 lie in wait all the more reasonable.
Gilstrap rejected Verizon's equitable estoppel argument on both the investment and post-investment theories, finding that Headwater never made representations broad enough to support a reasonable inference it had abandoned enforcement of its entire portfolio. He also declined to find waiver based on the investment period alone, noting Verizon had not shown Headwater knew of the infringement at the time the investment agreements were signed.
On the waiver question, Gilstrap distinguished his ruling from the laches bar the Supreme Court erected in SCA Hygiene Products Aktiebolag v. First Quality Baby Products, LLC, 580 U.S. 328 (2017), which prohibits laches as a defense to patent damages. He found implied waiver reaches underlying liability — not just damages — and therefore survives SCA Hygiene. He also drew on Petrella v. Metro-Goldwyn-Mayer, Inc., 572 U.S. 663 (2014), in which the Supreme Court acknowledged that equitable defenses beyond laches remain available.
Every law student, early on, learns the equitable concept of unclean hands, Gilstrap wrote. 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.
The ruling sets up a direct appellate test of whether implied waiver can extinguish patent liability — and the $175 million verdict with it — in a case where the patentee's delay was judicially found to be a calculated damages-maximization strategy rather than mere inattention.
Note: The docket caption lists Walmart Inc. as defendant, but the opinion addresses only Verizon entities. The relationship between Walmart and Verizon in this litigation is not explained in available court documents.