How much does it cost to change the applicant or inventor before the patent application is issued? Is it the same to change one item separately as to change two items together?

Changing the information of the applicant or inventor before the patent application is certified requires the official expenses of 200 yuan. The official expenses for changing one item alone and two items together are the same, both of which are 200 yuan. However, if you want to change the information displayed on the patent certificate, you must change the description as soon as possible, and it is safer to pay the registration fee after getting the compliance notice.