1. To apply for the same invention or utility model in China, it is required that the domestic or foreign priority period is twelve months and the design is six months;
2. The time for submitting a copy of the first patent application document is within 16 months from the date of filing;
3. Other provisions.
legal ground
Article 29 of the Patent Law of People's Republic of China (PRC)
An applicant who applies for a patent for invention or utility model for the first time in a foreign country within 12 months, or for a patent for design for the first time in a foreign country within 6 months, and applies for a patent on the same subject in China, may enjoy the priority according to the agreement signed by the foreign country and China or the international treaties to which they are both parties, or according to the principle of mutual recognition of priority.
Article 30
Where an applicant claims the priority of a patent for invention or utility model, he shall make a written statement at the time of application and submit a copy of the first patent application document within 16 months from the date of the first application.
Where an applicant claims the priority of a design patent, he shall make a written statement at the time of application and submit a copy of the first patent application document within three months.