It is recommended to entrust a professional and formal patent agency to handle it. For example, Beijing Hengbo Intellectual Property is a comprehensive intellectual property service provider with invalid patents as the main line, and has served many well-known big customers.
After the Patent Reexamination Board sends a copy of the request for invalidation of the patent right and relevant documents to the patentee, the patentee shall reply within a specified time limit, usually one month. At present, there are two main ways for enterprises to reply to patent invalidation: First, enterprises can submit relevant evidence to the Patent Reexamination Board to reply to patent invalidation. Second, enterprises can entrust patent agencies to handle matters related to patent invalidation defense. Defense is the best choice when a patent meets another person's request for invalidation.