Can patent applications be sent by post or express delivery?

It can be sent directly to China National Intellectual Property Administration Patent Office: Reception Office of China National Intellectual Property Administration Patent Office, No.6 West Tucheng Road, Jimenqiao, Haidian District, Beijing 100088. Registered mail must be used, and the certificate of registered mail must be kept to determine the application date (postmark date). After receiving the acceptance notice and payment notice sent back by the patent office, remit money to the patent office according to the account number and amount indicated in the payment notice. By the way, if the agency is responsible for writing application documents, drawing and handling process affairs for you, the agency fee of 1800 yuan is not high. It is not uncommon for people who have been rejected because of various problems after applying for a patent. Please get ready.