During the "April 26 IP Week" of 2026, the Han Kun-represented patent invalidation case No. 4W116431, involving an invention patent titled "Offset Decoding Device, Offset Coding Device, Image Filtering Device", was selected by China National Intellectual Property Administration (CNIPA) as one of the "Top 10 Typical Patent Re-examination and Invalidation Cases of 2025". The case serves as guidance for the in-depth interpretation patent examination criteria and for the clarification of patent protection rules.
The case involves an alleged standard-essential patent (SEP) relating to the H.265 standard. CNIPA's invalidation decision interpreted the rules for construing the protection scope of patent claims in invalidation proceedings and correctly evaluating the technical contribution of inventions in the field of video coding and decoding.
CNIPA's selection of this case as a top ten typical invalidation case exemplifies the Han Kun IP team's high professionalism in handling IP disputes involving complex technologies. The key team members handling this case were Haining Song, Lili Wu, Xi Wang, Shuo Zhang, and Yan Wu.
