South Korea\'s Patent Court on Thursday dismissed a request filed by LG Chem Ltd. calling for the revocation of a local tribunal\'s ruling to deregister its patent on the inorganic material-coated separator, a key component in electric vehicle (LV) batteries. LG Chem filed a patent infringement and damages lawsuit against SK Innovation Co., the owner of South Korea\'s biggest refiner SK Energy Co., accusing SK Innovation\'s lithium-ion battery separators (LiBS) of violating its patent in Dec. 2011.