The content of its claims shall prevail. "Article 20 of the Implementing Rules of the Patent Law also stipulates, "The claims should describe the technical features of the invention or utility model, and clearly and briefly state the scope of protection requested. It can be seen that the size and scope of patent rights are determined by the claims. "As the most important claim in a patent application document, its drafting quality is crucial to the right holder. The claim should include at least one independent claim and may also include dependent claims. The Implementing Rules stipulate," The independent claims should reflect the technical solution of the invention or utility model as a whole and record the necessary technical features to solve the technical problem. "Patent applicants must understand that the so-called necessary technical features in the independent claims are technical features that are indispensable for the invention or utility model to solve its technical problems, and are inventions that distinguish the technical solution of the invention or utility model from all prior technical solutions. points and the scope of protection that can be obtained after the patent is granted. Dependent claims are claims that follow the independent claims and further define the cited claims (including independent or dependent claims) with additional technical features. The subordinate claims of the claims are improvements to the independent claims and must fall within the scope of protection of the independent claims, but the independent claims are further optimized and limited by adding new technical features because the dependent claims are set forth in the independent claims. According to the optimization plan and further limitation of the technology, the scope of protection of independent claims must be wider than that of dependent claims, and infringement of independent claims may not directly infringe dependent claims. However, dependent rights also have their own rights. The most prominent function is that an independent claim can be upgraded to a new independent claim if it is declared invalid. For example, the examiner finds that a patent independent claim already exists to protect a mobile phone. For a wireless phone that can be used independently, the independent claim loses its novelty. However, there is a dependent claim in the same patent application that protects a mobile phone with a camera. If no mobile phone has been equipped with a camera before, the applicant can. By abandoning the original independent claim and modifying the dependent right into a new independent claim, the patent application can be approved. This is one of the wonderful uses of dependent rights.