When applying for an invention or utility model patent, a request, description, abstract, claims and other documents must be submitted. The date when the Patent Office receives the patent application documents is the filing date. If the application documents are mailed, the postmark date shall be the filing date: ① Within 12 months from the date when the applicant first files a patent application for the invention or utility model in a foreign country, or from the first time a design is filed in a foreign country. If a patent application is filed in China on the same subject within six months of the first filing of a patent application, the foreign country shall, in accordance with the agreement signed by the foreign country and China or an international treaty to which both countries are party, or in accordance with the principle of mutual recognition of priority. Can enjoy priority. If the applicant files another patent application for the same subject with the Patent Office within twelve months from the date of first filing a patent application for an invention or utility model in China, the applicant may enjoy priority.
② If the applicant claims priority, he shall make a written statement when applying and submit a copy of the first patent application document within three months; if the applicant fails to make a written statement or fails to receive it within the time limit, If a copy of the patent application document is submitted, it will be deemed that no priority has been claimed. An invention or utility model patent application shall be limited to one invention or utility model. Two or more inventions or utility models belonging to one general inventive concept can be filed as one application. A design patent application shall be limited to one design used in one product.