Polypore, Reckitt Benckiser, Microsoft: Intellectual Property
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Polypore International Inc.’s Celgard unit filed a patent-infringement suit against Sumitomo Chemical Co. over lithium-ion battery technology used in electronics and electric vehicles.
The complaint, filed Feb. 22 in federal court in Charlotte, North Carolina, claims Sumitomo is infringing patent 6,432,586, which was issued in 2002 and covers a separator in high-energy rechargeable batteries. The separators prevent short circuits that can reduce efficiency and limit safety problems from overheating.