Legal analysis: Invention patents reflect the intellectual achievements of workers, and the state has specially issued a patent law to protect citizens' intellectual achievements. According to the relevant provisions of the national patent law, the term of invention patent is 20 years, and the term of utility model patent and design patent is 10 years, both of which are counted from the date of application. The stipulation on the duration of patent protection is a concrete manifestation of implementing the statutory principles of China's civil law and safeguarding the legitimate rights and interests of inventors.
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, both of which are counted from the date of filing.