HAYWARD, Calif.--(BUSINESS WIRE)--Impax Laboratories, Inc. (NASDAQ:IPXL) today confirms that Warner Chilcott Laboratories Ireland Limited, Warner Chilcott Company, Inc., Warner Chilcott (US), LLC, and Mayne Pharma International Pty. Ltd. filed suit for patent infringement against Impax in the United States District Court for the District of New Jersey in response to Impax’s challenge of the patent listed in connection with Doryx® (doxycycline hyclate) delayed-release tablets, 150 mg.
