Supreme People’s Court of China — Chengdu Chip Co. v. Mao Tech (2023) 最高法知民终2903号 — Power-Management Chip Patent Infringement Reversed; SPC Tightens Doctrine of Equivalents for Logic-Circuit Patents
The Supreme People’s Court IP Tribunal reversed a first-instance finding of patent infringement in a power-management chip dispute, holding that pulse-signal generation circuit features in the accused chip differed from the patented features in means, function, and effect — and therefore neither identically infringed nor were equivalent. The decision is the SPC’s most prominent 2025 elaboration of the doctrine of equivalents in logic-circuit patents.