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