The international stage is the application stage, that is, from the date of filing the PCT international application to the expiration of the 30-month period. During this period, you can change the information of various descriptive items such as the applicant, and you can go to the corresponding country to make changes after more than 30 months. During this period, various notices will be received one after another.
The national stage is the authorization stage, that is, the applicant must enter the corresponding country if he wants to obtain authorization for this patent. The time to enter the national phase is from the date of PCT international application, and the deadline is 30 months from the priority date (365,438+0 months in some countries, such as South Korea/Europe/Australia, etc. ); There are also some countries that can pay for an extension of entry. For example, China can enter within 32 months from the priority date, and an additional grace period fee of 1 ,000 yuan is required for more than 30 months).