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CHARLOTTE, N.C., Feb. 25, 2013 (GLOBE NEWSWIRE) -- Celgard, LLC ("Celgard"), a subsidiary of Polypore International, Inc. (NYSE: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.
"Celgard has a long history of innovation in lithium-ion battery separators and is a world leader in this technology," said Robert B. Toth, Chairman, President and Chief Executive Officer of Polypore. "We have a responsibility to our customers, partners, and shareholders to safeguard the investments we make in innovation, and therefore will take appropriate steps like this to prevent the knowing and unfair exploitation of our intellectual property."
Celgard is represented by the law firm Kilpatrick Townsend & Stockton, LLP.
About Polypore International, Inc.
Polypore International, Inc. is a global high technology filtration company specializing in microporous membranes. Polypore's flat sheet and hollow fiber membranes are used in specialized applications that require the removal or separation of various materials from liquids, primarily in the ultrafiltration and microfiltration markets. Based in Charlotte, NC, Polypore International, Inc. is a market leader with manufacturing facilities or sales offices in ten countries serving six continents. See
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