Patent application drawings are usually printed black and white schematic diagrams. Of course, if the hand drawing is clear, it is sometimes accepted.
You can entrust a patent agency to handle the patent application, or you can submit the patent application documents to the patent office yourself. The specific process is as follows:
1) Prepare patent application documents (which may include claims, description, description drawings, abstract, and abstract drawings).
2) Fill in the patent application request form (including invention title, applicant, inventor and related information, etc.).
3) Pay the patent application fee.
4) After submitting these to the Patent Office, you can obtain the application date and application number, which will be used as the unique number for future patent office examination. The official acceptance notice will be issued within two weeks after the application date.
5) The Patent Office will examine and issue a notice of examination opinion or a notice of correction, which requires the applicant to respond within a specified time limit. After the examination is finally passed, the Patent Office will issue an authorization notice indicating that it agrees to the authorization.
6) After the applicant registers for authorization (pays the money), the patent authorization announcement becomes effective.
If you are applying for an invention patent, you can request the Patent Office to speed up the examination, but it may not be approved.
The chance of a patent being favored by the country is also relatively low.
For more information related to patent applications, you can search Beijing University United to get more detailed answers.