How long is the patent fee overdue?

The time to pay the annual patent fee and the corresponding situation are as follows:

Overdue 1 month: there will be no late payment fee;

Overdue for 2 months: a late fee of 5% of the annual fee will be incurred, which will be increased month by month thereafter;

Overdue for 6 months: a late fee of 25% of the annual fee will be incurred;

After 6 months overdue: patent recovery fee will be incurred, and patent termination notice will be received after 7 months overdue. After paying the annual fee, late payment fee and request fee within 2.5 months after receiving the notice, the applicant may apply to the state patent administration department for restoration of rights.