Can the patent fee be refunded?

The payer may, within three years from the date of payment, request the refund of the overpaid, re-paid or wrongly paid patent fees. The refund request shall be made in writing, with reasons and corresponding certificates, such as a copy of the fee receipt issued by the Patent Office, a remittance voucher issued by the post office or a bank and other supporting documents. The certificate provided by the post office or bank shall be the original. If the original cannot be provided, a notarized copy confirmed by the official seal of the department shall be provided.