Legal analysis: There are several situations in which a patent is invalid: First, the subject of a patent is not an invention, utility model or design stipulated by law. Second, a patent is an invention that violates the law, social morality or harms the public interest. Third, it violates the principle of one invention and one patent application. The fourth is to violate the confidentiality review regulations. Fifth, inventions and utility models are not novel, creative and practical. Sixth, the design is not novel. Seventh, the subject of patent belongs to the object that is not protected by patent law. Eighth, the specification does not fully disclose the technical content. Ninth, the claim is beyond the content of the specification. At the same time, the law stipulates that the modification of patent documents in the process of patent application cannot exceed the scope of the original specification and claims.
Legal basis: Article 25 of the Patent Law of People's Republic of China (PRC) does not grant a patent right for the following matters: (1) Scientific discovery; (2) rules and methods of intellectual activities; (3) Methods of diagnosis and treatment of diseases; (4) Species of animals and plants; (5) substances obtained by nuclear transformation; (six) the design of the pattern, color or the combination of the two. The production method of the products listed in Item (4) of the preceding paragraph may be granted a patent right in accordance with the provisions of this Law.