Where should I file a patent application?

What is the procedure for applying for a patent? A. Document writing: including patent abstract, patent claim and specification (if attached, the attached drawings shall be drawn) B. Application submission: the application given by the patent office shall be submitted together with the written documents as required, and the patent application number shall be given by the patent office at the same time; Download the patent application form C. Pay the application fee: within two months after submitting the application, you can pay it together with the application; D. Preliminary examination of patent: the examiner of the patent office conducts a preliminary examination, mainly to check the legality of writing format and content; E. patent announcement: if it is approved in the first instance, it will be announced to the public in the form of a patent announcement published by a publishing house; F acceptance of substantive examination: the actual examination fee shall be paid within three years after the patent announcement. If it is not paid, it will be treated as invalid; G. Examining international applications entering the national phase; H. Re-examination: If successful, a certificate will be issued and officially authorized by law; If it is not successful, the patent will enter the application procedure: 1. Protect the patent within the time limit prescribed by law, but pay the protection fee every year. If it is not handed in, it will be treated as invalid.