Legal analysis: According to the provisions of the Patent Law, the protection period of an invention patent is 20 years, counting from the date of application. After the patent protection period, the invention patent will enter the public domain, and others can use it at will, so as to better meet people's production and life needs.
Legal basis: Article 42 of the Patent Law of People's Republic of China (PRC) has a term of 20 years, and the term of utility model patent and design patent is 10 years, counting from the date of filing.