On February 22, 2013, Celgard, LLC filed a patent infringement claim against Sumitomo Chemical Co., Ltd. The complaint accuses Sumitomo of infringing Celgard’s U.S. Pat. No. 6,432,586 (hereafter ‘586), which covers a separator technology for use in lithium ion batteries. Sumitimo is accused of willful infringement of the ‘586 patent particularly through its sale of separators to Panasonic for use in the Toughbook line mobile computers.