Legal analysis: According to the relevant laws of our country, the patent right has a set time limit. The term of patent right for invention is twenty years, and the term of patent right for utility model and patent right for design is ten years. The patent right is only valid within the statutory time limit. If this period is exceeded, the patentability of inventions will be absolutely eliminated, and inventions will enter the public domain and become the common property of all mankind. The term of the patent right shall be counted from the date of application. Article 42 of the Patent Law stipulates that 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 filing. This article explains that patent right is different from movable property and immovable property. The ownership of movable and immovable property has no time limit, but the patent right is only valid within the time limit prescribed by law. This feature of patent right is determined by its essence and purpose. The purpose of establishing a patent system is to encourage inventions through the protection and use of inventions, and it must seek a balance between the interests of inventors and the public.
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.