Legal analysis: 1. Patent application documents can be submitted to the Patent Office; 2. They can be submitted directly to the Patent Office in person; 3. They can be sent by registered mail to the Patent Office; 4. They can be entrusted with an agency to handle the application.

Legal basis: "Patent Law of the People's Republic of China"

Article 26 To apply for an invention or utility model patent, a request, description and abstract shall be submitted and claims and other documents.

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

The description shall provide a clear and complete description of the invention or utility model, which shall be subject to the ability of a skilled person in the relevant technical field to realize it; when necessary, there shall be accompanying drawings. The abstract should briefly describe the technical key points of the invention or utility model.

The claims should be based on the description and clearly and briefly define the scope of patent protection requested.

For inventions and creations that rely on genetic resources, the applicant shall state the direct source and original source of the genetic resource in the patent application document; if the applicant cannot explain the original source, the applicant shall state the reasons.

Article 28 The date when the patent administration department of the State Council receives the patent application documents is the filing date. If the application documents are mailed, the postmark date shall be the date of application.