1. It must comply with legal norms. If an invention or utility model has only one independent claim, the independent claim shall be written first, and then the subordinate claim shall be written. Where there are multiple claims, they shall be numbered in Arabic numerals.
2. The technical terms used in the claim shall be consistent with those used in the specification of the patent application, and there may be chemical formulas or mathematical formulas, but there shall be no illustrations. When applying for a patent for design, the claims submitted shall include pictures or photographs of the design in duplicate.
3. The written expression in the claim should be rigorous and accurate, and the language should be concise and standardized. Don't use uncertain words and advertising words, use limited words. The words in the claims need to be typed or printed.