According to the provisions of China's patent law, this validity period is generally determined according to the provisions of the national patent law, but it is generally 20 years. If you apply for an extension, you can generally apply for 5 years. The specific situation varies according to the provisions of the patent laws of various countries.
Legal objectivity:
Article 42 of the Patent Law of People's Republic of China (PRC) has a term of 20 years for invention patents, and 10 years for utility model patents and design patents, counting from the date of filing.