Recently, the Supreme People's Court rendered the final judgment (2023) Zui Gao Fa Zhi Xing Zhong No. 922 in the case of Chongqing A Biotechnology Co., Ltd. v. National Intellectual Property Administration and the third party Denka Company Limited regarding an invention patent invalidation administrative dispute. The Court dismissed the appeal filed by Appellant Chongqing A Biotechnology Co., Ltd. and upheld the validity of Chinese Invention Patent No. 201410058250.0 owned by Denka Company Limited (entitled "Method and kit for quantitative determination of small and dense LDL cholesterol", hereinafter referred to as the "Patent-in-Suit").

Previously, Chongqing A Biotechnology Co., Ltd. had filed three invalidation requests against the Patent-in-Suit, and the patent was maintained valid in all instances. Beijing Caihe Law Firm was entrusted by Denka Company Limited to act as the patent owner's agent in the above invalidation request cases and administrative litigation cases.