Breakdown of Cross-Border Cooperation Triggers RMB Million Patent Lawsuit: Court Clarifies 3 Rules on Implied Patent Licensing

WISECODE Take

Many companies involved in cross-border partnerships assume that past informal consent implies legal permission to use patented technology after cooperation ends. This perspective incorrectly equates business tacit understanding with formal legal authorization. The Guangzhou Intellectual Property Court recently published a million-yuan patent infringement case, clarifying three criteria for the defense of implied patent licensing. The key ruling indicates that without an explicit written agreement upon contract termination, past informal cooperation alone can hardly withstand legal scrutiny. This ruling mainly poses risks for companies engaged in joint technology development rather than simple standard manufacturers. As part of our patent portfolio audit services, Zhidian frequently reminds clients to specify IP termination terms in contracts. To mitigate such risks, businesses should take two concrete steps. First, sign formal written licensing agreements early on that clearly define patent ownership after partnership termination; second, strictly preserve negotiation emails and meeting records to serve as factual evidence. Without written authorization, past tacit consensus inevitably collapses into unprovable oral assertions in court.