Penwest Pharmaceutical Announces Issuance of Patent Related to OPANA ER

DANBURY, Conn., Oct. 3, 2007 (PRIME NEWSWIRE) -- Penwest Pharmaceuticals Co. (Nasdaq:PPCO) today announced the issuance by the U.S. Patent and Trademark Office (USPTO) of U.S. Patent No. 7276250, titled “Sustained Release Formulations of Oxymorphone.”