US pharma cos sue Lupin for patent infringement (Express India)
US pharma cos sue Lupin for patent infringement (Express India)
US-based Purdue Pharma Products LP and UK-based Napp Pharmaceutical Group have sued Lupin Ltd and its US subsidiary, Lupin Pharma Inc, claiming that their attempt to manufacture and market the generic version of the analgesic tramadol ER infringes patent coverage of the innovator.