How to determine the application date of patent application documents in post office

A: The date of application is subject to the postmark. If the postmark date is unclear, the date of receipt shall be the application date.

The legal provisions are as follows:

Article 28 of the Patent Law The date when the patent administrative department of the State Council receives the patent application documents shall be the filing date. If the application documents are mailed, the postmark date of mailing shall be the application date.

All documents specified in Article 4 of the Detailed Rules for the Implementation of the Patent Law shall be submitted on the postmark date mailed to the patent administration department of the State Council; If the postmark date is unclear, the date of receipt by the the State Council Patent Administration Department shall be the filing date, unless the parties can provide proof.