1. According to the manual. It means that the claim should be supported by the specification, that is, the form and content of the claim should be consistent with the content reflected in the specification, the language in the claim should be reflected in the specification, the technical features recorded in the claim are recorded in the specification, and the substantive content should be consistent and not beyond the scope of the specification.
2. Explain the scope of patent protection. As the patent claim is the core of the patent application document and has direct legal effect, it is the basis for judging patent infringement after being granted a patent, and it is also the basis for proposing the revocation and invalidation of the patent right. Therefore, it is particularly important for the applicant to carefully write down the scope of patent protection in the claim, which requires the applicant to completely record all the technical features of the invention or utility model in the claim, neither too wide nor too narrow.