The reasons for invalidation of a patent are: 1. The subject matter does not meet the conditions for patent grant, including: the subject matter of an invention or utility model does not have novelty, creativity or practicality; the subject matter of a design patent does not have novelty or conflict with the previously acquired legal rights of others. 2. Illegal situations in patent applications: the description does not fully disclose the invention or utility model; the claims of the authorized patent are not based on the description; the modification of the patent application document exceeds the prescribed scope; the subject matter of the patent does not conform to the invention or utility model. The definition of new type or design; the principle of negotiation and authorization for simultaneous applications; the claims of the authorized patent are unclear, not concise or lack the necessary technical features to solve its technical problems. 3. Violations of mandatory provisions of the law, including: violations of national laws, social ethics or harm to the interests of the public; scientific discoveries and other legal provisions that do not grant patent rights. 4. Situation of repeated authorization: If two or more applicants apply for patents for the same invention and creation, the patent right is granted to the first person to apply. That is, an invention and creation is only granted patent right to one person (the first person to apply). . Inventions, utility models and designs cannot obtain patent rights under the above circumstances. If patent rights have been obtained, they can be declared invalid. "Patent Law Implementing Rules" Article 65 "Patent Law of the People's Republic of China" Article 2 "Patent Law of the People's Republic of China" Article 5 "Patent Law of the People's Republic of China" Article 22 "Patent Law of the People's Republic of China" Article 45