After the patent application is authorized, mark "ZL" before the application number, which is the patent number of the patent. The patent number is the number given when the patent right is granted, and it is a submission number. The submission number is the serial number compiled by each industrial property office when publishing patent documents (including public publication and reading and copying only). After the patent applicant obtains the patent right, the patent number on the patent certificate issued by China National Intellectual Property Administration is ZL (patent initials)+application number. If a patent is being applied, but the ZL letter is added before the application number (making consumers mistakenly think it is an authorized patent), it is a counterfeit patent and the administrative department for industry and commerce will investigate and deal with it according to law. Characteristic exclusivity, which means very simply, means that within a certain period of time (within the validity period of the patent right) and within the region (within the legal jurisdiction), no unit or individual may implement the regionality of its patent without the permission of the patentee. Regionality means that patent right is a kind of right with limited geographical scope, which is only valid within the legal jurisdiction. Timeliness means that a patent is only valid within the time limit prescribed by law. After the expiration of the effective protection period of the patent right, the patent right enjoyed by the patentee will be automatically lost and generally cannot be renewed. Functional differentiation: similar products of other enterprises can be distinguished from their own products to avoid confusion among consumers; Warning function: Since patents are protected by national laws, no one may copy and sell them without permission. Advertising function: Consumers usually think that products marked with patent marks or patent numbers are superior to similar traditional products in technical performance and use function, so they will trust the quality of products and expand their market share.