Legal analysis: Patent priority means that after a patent applicant first files a patent application in a certain country for his invention and creation, he files another patent application for the same subject invention and creation within the statutory period. According to Relevant laws stipulate that for subsequent applications, the date of the first patent application shall be regarded as the filing date. This right enjoyed by the patent applicant in accordance with the law is the right of priority. The purpose of patent priority is to exclude those who copy the patent in other countries and have the possibility to apply for it first and obtain registration.
Legal basis: "Patent Law of the People's Republic of China" 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.