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Endo Sues Barr Over Opana Patents

Law360 (October 22, 2008, 12:00 AM EDT) -- Endo Pharmaceuticals Inc. and Penwest Pharmaceuticals Co. accused Barr Laboratories Inc. of patent infringement Monday in their latest action to keep a generic version of the painkiller Opana ER off the market.

The complaint, filed in the U.S. District Court for the District of Delaware, alleges Barr infringed two patents for Opana ER’s extended-release technology when it submitted an abbreviated new drug application for a generic version of the painkiller to the U.S. Food and Drug Administration.

Barr is seeking to produce an oxymorphone hydrochloride extended-release...
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