Meaning
Legal process of revoking the validity of a granted patent through an administrative or judicial challenge. This patent invalidation occurs when a third party provides evidence that the patent does not meet the requirements of novelty, inventiveness, or practical applicability. It is a critical tool for manufacturing firms to clear competitive barriers or defend against infringement claims.
Administrative Forum
The Reexamination and Invalidation Department of the China National Intellectual Property Administration hears the initial petitions for this procedure. A request for patent invalidation can be filed at any time after the patent is granted, provided the petitioner submits prior art that predates the filing of the patent. The department issues a decision that can uphold the patent, declare it partially invalid, or revoke it entirely.
Evidence Requirement
Success depends on the quality of the technical documents and publications sourced from global databases. In the context of patent invalidation, the burden of proof lies with the petitioner to demonstrate that the claimed invention was already known to the public. Complex technical comparisons are often supported by expert testimonies or experimental data to show a lack of inventive step.
Litigation Strategy
Defense against a patent infringement lawsuit frequently involves filing a counter-petition for invalidity. If the patent invalidation is successful, the infringement case usually loses its legal basis and is dismissed by the court. The retroactive effect of an invalidation decision means the patent is deemed never to have existed, although completed licensing payments or executed court orders are generally not recovered.
