How to determine the date of patent application?

Legal analysis: 1. Where the applicant personally submits the documents to the Patent Office, the date when the Patent Office receives the documents shall be the date of filing;

2. If the application documents are mailed, the postmark date of mailing shall be the application date.

3. If the postmark is illegible or illegible, the Patent Office will inform the applicant, and if the applicant can submit evidence of the exact date when the application documents were sent in the post office, the date of sending the documents will be the application date; How to determine the specific date of patent application

4. Where the applicant can't provide relevant supporting documents, the date of receipt of the application documents by the patent administrative department of the State Council shall be the filing date.

Legal basis: Article 28 of the Patent Law of People's Republic of China (PRC). The date when the patent administrative department of the State Council receives the patent application documents is the filing date. If the application documents are mailed, the postmark date of mailing shall be the application date.