Answer: (1) The scope of application of the priority principle. The priority principle in the Paris Convention does not apply to all industrial property rights, but only to invention patents, utility models, designs and trademarks. (2) Priority applicant scope and application conditions. According to the provisions of the Convention, a person who has formally filed an application for the registration of an invention patent, utility model, design or trademark in one member country or his legal successor shall have the priority to file an application in other member countries within the prescribed time limit. (3) Time limit for applying for priority. The priority application period for invention patents and utility models is 12 months, and the priority application period for designs and trademarks is 6 months. (4) Certificate and priority. In countries where the applicant has the right to choose to apply for a patent certificate or an inventor's certificate, the application for an inventor's certificate also enjoys priority, with the same conditions and effects as the application for a patent certificate.