On October 8, 2021, the China National Intellectual Property Administration declared all claims of CN104219523B invalid. The patent is owned by the Electronics and Telecommunications Research Institute (ETRI). The CN’523 patent is related to patents that are designated essential to the Access Advance (formerly known as HEVC Advance) patent pool as well as SISVEL’s AV1 and VP9 patent pools. It is also related to U.S. Patent 8,867,854, which Unified challenged in IPR2020-01048.

Unified is represented by Tao Chen at Wei Chixue Law Firm, and the case is managed by in-house counsel, Jessica L.A. Marks and Roshan Mansinghani.