A Delaware federal judge ruled on Oct. 13 that Actavis Laboratories FL Inc. infringed three patents with a planned generic version of the weight-loss drug Contrave, rejecting the company’s defense as a “classic case” of hindsight bias.

In a 35-page opinion, U.S. District Judge Richard G. Andrews of the District of Delaware said that Actavis had failed to invalidate Orexigen Therapeutics Inc.’s patents during a three-day trial in June.