Paragraph 2 of Article 4 of the Detailed Rules for the Implementation of the Patent Law of People's Republic of China (PRC) stipulates: "If a party entrusts 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 contact person specified in the request. " This requires the applicant to "designate" the contact person when filing the patent application.