https://www.edaily.co.kr/news/read?newsId=01262806596316160&mediaCodeNo=257&OutLnkChk=Y 

A mid-sized company in South Korea, I pharmaceutical company, filed an invalidation trial against L company in South Korea, for which a non-exclusive license was granted, and which had filed a patent infringement trial against I pharmaceutical company. AIP, representing I pharmaceutical company, discovered that the patent of L company features the invention of the crystalline compound, and ended all related patent disputes by invalidating the patent by developing a legal principle on the theory of patentability of the invention of the crystalline compound. The Supreme Court’s ruling in this case, which adopted AIP’s arguments on the invalidation became a leading case, which first judged legal principles on the patentability of the invention of the crystalline compound.