Under what circumstances can I not pay the patent maintenance fee?

There is no need to pay the patent maintenance fee in the following cases: 1, and the annual fee for the first year has been paid in the authorized year, so there is no need to pay the maintenance fee this year;

2, from the third year of the patent application to the year of authorization, no matter how many years have passed, the maintenance fees for these years shall be paid together;

3. If the invention patent is rejected after substantive examination and is not authorized, there is no need to pay maintenance fee.