What are the reasons for declaring a patent invalid?

Legal analysis: 1, the subject does not meet the conditions for patent grant. 2. Illegal circumstances in the patent application, such as the invention or utility model not fully disclosed in the specification; The claims are not based on the specification or the like. 3. Violate the mandatory provisions of the law. Such as violating national laws, social morality or harming public interests. 4. Duplicate authorization.

Legal basis: People's Republic of China (PRC) Patent Law.

Article 26 Where an applicant applies for a patent for invention or utility model, he shall submit the written request, specification and its abstract, patent right and other documents.

The request shall specify the name of the invention or utility model, the name of the inventor, the name and address of the applicant and other matters.

The specification shall give a clear and complete description of the invention or utility model, which shall be subject to the realization of the technical personnel in the technical field; Attached drawings shall be attached when necessary. The technical points of the invention or utility model shall be briefly explained.

The patent claim shall be based on the specification, and clearly and briefly define the scope of patent protection.

For inventions that rely on genetic resources, the applicant shall state the direct source and original source of genetic resources in the patent application documents; If the applicant cannot explain the original source, it shall explain the reasons.

Article 42 The term of patent right for invention is 20 years, and the term of patent right for utility model and patent right for design is 10 years, counting from the date of application.