Sub Assembly Mapping Strategies under PRC Patent Law
Mapping sub-assemblies against PRC patent claims separates component scope from combined assembly limitations to manage indirect liability and customs hold risks.
Claim Scope Division
Meaning
Patent boundary construction methods used by Chinese courts separate protected technical features from the public domain to resolve patent infringement disputes. A proper claim scope division involves analyzing the independent and dependent claims of a patent to identify the precise limits of the patentee’s exclusive rights. This analytical process determines whether an accused product falls within the protective scope of the patent.
It forms the foundation of both defense and prosecution strategies in industrial intellectual property disputes.
Boundary Construction
The division begins with a literal reading of the claim text. Courts examine the technical terms used in the patent documentation and interpret them according to ordinary engineering definitions. This defines the primary boundary of protection.
Infringement Assessment
Determining infringement requires comparing each element of the accused product with the separated features of the patent claims. Under the doctrine of equivalents, a court may find that a product infringes even if it does not match the literal claim scope division, provided that the differences are insubstantial. This requires the defendant to present technical data and prior art to show that their product utilizes public knowledge.
Clear division of the claims prevents the patentee from overextending their monopoly to capture unrelated technologies.
Procedural Defense
Defendants can utilize file wrapper estoppel to limit the scope of the claims. If a patentee narrowed their claims during the prosecution phase to secure the patent, they cannot later expand them during litigation. This legal defense relies on a thorough analysis of the patent office’s historical records.
It provides a reliable shield for manufacturers facing infringement claims.