1. Generally, when the other party applies for invalidation of the patent right, the patentee can reply. First of all, it is necessary to clarify the reason why the other party declares the patent invalid.
2. On the basis of finding out the invalid reasons, break each other's invalid reasons one by one.
3. Don't give evidence yet. If the other party declares the patent invalid, the other party bears the first burden of proof. Look at each other's flaws first, and let the other's evidence and reasons be invalid first. Attack and defend, not defend first. If the other party's invalid reason is not established, no proof is needed. Only after the first proof is completed will the burden of proof be transferred to the obligee. Patent literally refers to exclusive rights and interests. The word "patent" comes from Latin Litteraepatentes, which means open letters or open documents. It is a certificate used by medieval monarchs to issue certain privileges, and later refers to the exclusive rights certificate signed by the British king himself.