Just changed the patent.

(1) If the fee for this patent application has not been paid, directly re-submit a new application, and use you and Zhang San as applicants to claim the priority of this patent, so as not to lose the filing date and pay more. The previous case will be dropped directly because it has been asked for domestic priority.

(2) If the application fee has been paid, it needs to be submitted by filing the project change, and at the same time, it needs to submit the certificate issued by the original applicant (that is, you) agreeing to increase Zhang San as the second applicant, and then pay the 200 yuan for filing the project change fee.