A Delaware federal judge on Feb. 16 overturned a massive $2.5 billion jury verdict against Gilead Sciences Inc., finding that a patent held by a unit of Merck & Co. Inc. was too broad to be valid.

The ruling from U.S. District Chief Judge Leonard P. Stark of the District of Delaware reversed a federal jury’s finding in 2016 that Gilead had willfully infringed on Idenix Pharmaceutical’s patent, which discloses a “groundbreaking” treatment for hepatitis C. The verdict was the largest-ever reported in a patent, according to defense counsel in the case.