Impax Laboratories, Inc. (NASDAQ:IPXL) today confirms that Alza Corporation has filed suit for patent infringement against Impax in the United States District Court for the District of Delaware in connection with Concerta® (methylphenidate hydrochloride) extended-release 18, 27 and 36 mg tablets. The Company previously announced on November 29, 2010, confirmation of a patent suit relating to Concerta® 54 mg tablets.
