What procedures must I go through to apply for a patent?

What materials should I prepare to apply for a national invention patent? 1. Claim: The description of the claimed invention refers to the substantive technical features of the invention. Description: Summarize the invention (within 300 words). Description: explain the technical field to which the invention belongs; Explain the background related to the invention; Explain the purpose of the present invention; The technical scheme of the invention is explained in detail; Explain the effect and advantages of this technical scheme; Relevant experiments and data prove its effect and advantages. Specifically, for inventions in the mechanical field, the structural schematic diagram of the product patent should be provided, explaining the structure and shape characteristics of the product, the names and connection relations of the components, and the working principle. For inventions involving the field of electricity, the names of components and the electrical relationship between components shall be provided. For inventions involving the chemical field, the names, preparation methods and technological conditions of specific chemical substances shall be provided. For an invention involving a chemical equipment system, the connection relationship between the equipment shall be provided, and the structural characteristics and connection relationship of the equipment related to the invention shall be specified. Where a pharmaceutical invention is involved, the composition, content, preparation method, clinical or animal experimental methods and experimental data of the drug shall be provided. Inventions involving microbiology and bioengineering should provide certificates for preservation.