https://news.naver.com/main/read.nhn?mode=LSD&mid=sec&sid1=102&oid=011&aid=0000068888 

Company W, the patentee, filed a patent infringement lawsuit and damage claim against Company L, claiming that the Kimchi refrigerator of Company L infringed the patent of Company W. AIP, on behalf of Company L, had the lawsuit from Company W dismissed by proving that the Kimchi refrigerators manufactured and sold by Company L were made of publicly known technology and thus became freely implementable technology that anyone could use.