How does China stipulate the principle of patent priority?

Domestic priority can be used as a procedure to restore the right to apply. When the previous application was deemed to be withdrawn for various reasons, it needed 1 000 yuan to restore the rights, and the restoration time was only two months, and there must be certain reasons. If it is within the priority period, it is economical and convenient for the applicant to resubmit the application and claim domestic priority. Can be used to improve existing applications. During the priority period, the applicant may supplement the previous application with embodiments or add new elements to improve the previous application, but shall not change the theme of the previous application. In this case, the part that has been clearly disclosed in the earlier application can enjoy priority, but the new content that is applied later cannot enjoy priority, and the application date of the later application is used as the time standard to judge the novelty and creativity of the new content. The Patent Office shall not refuse to grant priority on the grounds that some elements of the later application claiming priority are not included in the claim of the earlier application as the basis of priority, but these elements must be clearly stated as a whole in the application documents. By claiming multiple domestic priorities, the applicant can file a joint application. The Patent Office shall not refuse to grant priority or reject the patent application because the applicant claims multiple priorities, or because one or several elements of the application claiming one or more priorities are not included in the application as the basis of priority, as long as the above two situations do not violate the singularity of the invention. During the priority period, the mutual conversion between invention and utility model patent application can be realized by using the priority clause. Where the applicant claims domestic priority, and the earlier application was an application for a patent for invention, he may file an application for a patent for invention or utility model on the same subject; Where the earlier application is an application for a patent for utility model, an application for a patent for utility model or invention may be filed on the same subject. For example, when the applicant discovers the existing technical documents that affect the creativity of the previous application for a patent for invention, he can submit an application for a patent for utility model with priority to the Patent Office within the priority period to ensure that the application will not be rejected. The earlier application is an application for a patent for utility model of the product, and the applicant has completed the production method of the utility model product within the priority period, and can submit an application for a patent for the invention of the product and production method with the same theme to supplement the method invention. Where an applicant who can save money claims domestic priority, his earlier application shall be deemed to have been withdrawn from the date when the latter application is filed. The applicant only needs to pay the fee of the latter application, while the earlier application as the basis of priority will save all other fees except the paid application fee, and the protection with the same effect is particularly beneficial to the joint application. The use of priority can extend the patent protection period. After the first application, the applicant filed a second application before the expiration of the priority period, claiming the priority of the earlier application. After the application is approved, the patent protection period shall be counted from the filing date of the latter application, thus extending the patent protection period from the filing date of the previous application to the filing date of the latter application. After China's accession to the Patent Cooperation Treaty (PCT), China applicants can enjoy domestic priority regardless of whether they submit PCT international applications to designate China or domestic applications. However, in the absence of domestic priority, if they do not submit a PCT application, if they submit a second domestic application on the same subject to the Patent Office, they will not enjoy domestic priority. The establishment of domestic priority gives the applicant the opportunity to improve his previous application, realize the mutual conversion between invention and utility model patent application and realize joint application. It provides the applicant who filed his first application in China with favorable conditions for continuing to apply for a patent, so that he enjoys the priority treatment stipulated in the Paris Convention, just like foreign applicants.