The main content of priority is that if an applicant applies for a patent for invention or utility model for the first time in a foreign country within twelve months, or applies for a patent for design for the first time in a foreign country within six months, and applies for a patent on the same subject in China, he can enjoy priority according to the agreement signed between the foreign country and China or the international treaties to which he is a party, or according to the principle of mutual recognition of priority. An applicant who files an application for a patent for invention or utility model with the administrative department for patent in the State Council within 12 months from the date when he first filed an application in China may enjoy priority. The former is foreign priority and the latter is domestic priority, which is different in the applicable patent types and application places. The practical significance of priority is to take the date of the first patent application as the time standard for judging novelty. The date of the first application is called the priority date, and the above-mentioned specific period is called the priority period. Where the applicant claims priority, he shall make a written statement at the time of application and submit a copy of the first patent application document within three months; Failing to submit a written statement or a copy of the patent application documents within the time limit shall be deemed as not claiming priority. When the first application is abandoned or rejected, its priority still exists. Priority can be assigned, that is, it can be assigned together with the right to apply for a patent.
If you have applied for the same subject before, you can use the priority of this patent within 12 months. If this is your first application, you should not fill it out.