Priority date refers to the date when priority is claimed in the process of patent (or utility model) application. Priority is divided into foreign priority and domestic priority.
Priority date can also be aimed at domestic priority. For domestic priority, the priority date is explained as follows. Suppose someone applied to the National Copyright Administration of China for a patent on1October 12+ 1, but for some reasons (for example, the application document of this patent was poorly written at that time, or the scope of protection was too small, or there were loopholes in the patent applied at that time), the application for this patent was rejected by the Copyright Administration, or he took the initiative to withdraw it because he felt that it was not good. Then within one year (that is, before 20 12 12 3 1), after improvement, this person filed a similar patent application with the National Copyright Administration again. Then this person will worry that between his first application and his second application, if others know his patented technology and apply for a patent before his second application, won't his second application be invalid? In this case, when the person applies for the second time, he can request to declare priority in the patent request, stating that he has priority over the patent he applied for for for the first time. At this time, the date of the first application (20 12 65438+ 10/) is the priority date of the second application.