Law360, New York (January 28, 2008) -- Endo Pharmaceuticals Holdings Inc. and Penwest Pharmaceuticals Co. have tied Impax Laboratories Inc. into another patent infringement lawsuit as the company moves closer to marketing a generic version of pain treatment Opana ER.
Chadds Ford, Pa.-based Endo and Danbury, Conn.-based Penwest said Friday they lodged the suit in the U.S. District Court for the District of Delaware in reaction to Impax’s notice last...
