Various documents of the Patent Office can be delivered to the parties by mail, direct delivery or announcement. If the parties entrust a patent agency, the documents shall be sent to the patent agency; If a patent agency is not entrusted, the document shall be sent to the first signatory or representative in the request. If a party refuses to receive a document, it shall be deemed to have been served. All documents mailed by the Patent Office shall be valid for fifteen days from the date of issuance.
Presumption is the date when the parties receive the documents. Documents that should be served directly according to the provisions of the Patent Office shall be served on the date of delivery: if the address of the document is unclear and it cannot be mailed, it can be served on the parties by announcement. One month after the date of announcement, the document shall be deemed to have been delivered.