Polypore's Celgard Files Patent Infringement Suit

Celgard, LLC ("Celgard"), a subsidiary of Polypore International, Inc.

, has filed a complaint in the U.S. District Court of the Western District of North Carolina against Sumitomo Chemical Company, Limited. The complaint alleges that Sumitomo Chemical has infringed Celgard's United States Patent No. 6,432,586 issued for an invention entitled, "Separator for a High Energy Rechargeable Lithium Battery." The patent in the lawsuit covers ceramic composite layer lithium-ion battery separators first developed by Celgard for high-energy rechargeable lithium-ion batteries. This lawsuit has been filed after a period in which Celgard attempted to resolve its concerns with Sumitomo Chemical over infringement of Celgard's patent.