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Celgard sues MTI for patent infringement of ceramic-coated separators used in Li-ion batteries

Celgard, LLC, a subsidiary of Polypore International, LP, filed a complaint in U.S. District Court for the Northern District of California against MTI Corporation, seller of ceramic coated separators for lithium batteries in Richmond, California.

The complaint alleges that MTI 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. The lawsuit seeks an injunction preventing MTI from selling ceramic coated battery separators that infringe Celgard's patent and it also seeks compensation for damages.

A separate complaint filed by Celgard in US District Court for the Western District of North Carolina against MTI seeks an injunction preventing MTI from infringing trademarks and from selling unauthorized and counterfeit ceramic coated battery separators with the Celgard registered brand name and Celgard labeling, and also seeks compensation for damages.

Celgard said it is taking these actions to safeguard its assets and customers, and will continue to take appropriate steps to prevent the unfair exploitation of its intellectual property.

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