The claim is based on the specification, indicating the scope of patent protection with the technical features that constitute the technical scheme of the invention or utility model. According to different writing methods, claims can be divided into independent claims and subordinate claims.
The independent claim shall reflect the technical scheme of the invention or utility model as a whole and record the necessary technical features needed to solve the technical problems to be solved by the invention or utility model. The sum of the necessary technical features should be enough to constitute a technical scheme of an invention or utility model, and it is more novel and creative than the existing technical scheme.
The dependent claims shall further define the cited claims with additional technical features. Additional technical features may be technical features that further define the technical features of the cited claims, or may be additional technical features. The technical features contained in the dependent claim include not only the technical features attached to it, but also all the technical features of the claims to which it belongs. Therefore, the scope of protection determined by the dependent claims is smaller than that of the claims to which it belongs.
An invention or utility model should have only one independent claim, which is written before the subordinate claim. The claims shall be based on the description, and the claims shall be clear and concise.