What are the specific requirements for applying for patent documents? Thank you.

The paper quality of patent application documents should be equivalent to that of copy paper. No useless words, marks, boxes, lines, etc. On the paper. All documents shall be A4 size (2 10/0mm× 297mm) paper. The paper of patent application documents should be used vertically. The text is arranged from left to right, with 25 mm blank in the upper left and 15 mm blank in the lower right, which is convenient for publication and review. The front pages of all parts of the application documents must use the format uniformly formulated by China National Intellectual Property Administration. These forms can be obtained from the consulting office in the reception hall of the Patent Office, from patent offices around the country, or directly downloaded from the website of China National Intellectual Property Administration.