What requirements can a patent claim have?

There should be at least one independent claim in the claim of an application, but because two or more inventions or utility models with the same concept can be jointly applied, there can be more than two independent claims, both of which have independent legal significance and are parallel claims, but one should be determined as the main claim, which is called the first independent claim. Each independent claim can have multiple dependent claims. In a word, the patent claim is an important document in the patent application, which limits the protection scope of the patent application according to the specification and is also the legal basis for judging whether there is infringement in the future. Legal basis: Article 22 of the Patent Law of People's Republic of China (PRC), the invention and utility model for which a patent is applied shall be novel, creative and practical. Novelty means that the invention or utility model does not belong to the prior art; Before the filing date, no unit or individual filed an application for the same invention or utility model with the administrative department for patent in the State Council, and it was recorded in the patent application documents published or announced after the filing date. Creativity means that compared with the prior art, the invention has outstanding substantive features and remarkable progress, and the utility model has substantive features and progress. Practicality means that the invention or utility model can be manufactured or used and can produce positive effects. The existing technology mentioned in this law refers to the technology known to the public at home and abroad before the date of application.