LED packaging service provider Everlight Electronics has announced the US Supreme Court on October 1 returned its final verdict invalidating Japan-based Nichia's two US patents concerning YAG, a phosphor material used to make white LED chips: US5 998 925 and US 7 531 960.
Everlight in April 2012 filed with the US District Court for the Eastern District of Michigan for declaratory judgment of the invalidity and non-infringement of the two patents. The court in April 2015 made preliminary judgment that the two patents were invalid because one was not progressive technologically and the other was practically unable to come into force. The court affirmed its preliminary decision in January 2016.
In response, Nichia appealed to the US Court of Appeals for the Federal Circuit (CAFC), and CAFC upheld the invalidity of the two patents in March 2018. Then, Nichia appealed to the US Supreme Court, which dismissed the appeal on October 1.