Legal analysis: The patent right of each invention is timely and has a protection period of 20 years. This is also one of the characteristics of patent rights as intellectual property rights that distinguishes them from tangible property ownership. When an invention patent expires or is terminated early, the patent rights no longer exist even if the technology still exists. The inventor's exclusive right to use the technology will therefore no longer exist, and the social wealth created by this invention can be used by anyone for free.
Legal basis: "Patent Law of the People's Republic of China" Article 42 The term of invention patent rights is twenty years, and the term of utility model patent rights and design patent rights is ten years , are calculated from the date of application.