Article 4 of the Paris Convention stipulates that invention patent applications are allowed to serve as the basis for priority, and subsequent applications can be converted into utility models through the priority system. That is to say, if the subsequent utility model application is a utility model application, the priority of the invention patent application can be claimed, and the utility model is also allowed to be used as the basis for the priority of the subsequent invention patent application. At the same time, the Paris Convention also stipulates that the earlier application is a utility model and the later application is a design. The design can claim priority for the utility model. However, when the Paris Convention mentions the conversion of utility models and designs, it only stipulates it from the perspective of time limit, that is, it emphasizes that if a design requires utility model priority, the priority time limit is 6 months. instead of 12 months.