Legal analysis: the protection period of invention patent in China is 20 years, and the protection period of utility model patent and design patent is 10 year; Calculated from the date of patent application; The copyright protection period of China citizens' works is 50 years before and after the author's death.
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.