According to the inquiry method, if the patent applicant overpays, wrongly pays or re-pays the fee, he can request a refund from the Patent Office and return it after verification. If it is not submitted for more than one year, it will generally not be returned.
Payment can be made by post office, bank remittance or other means stipulated by the patent administration department of the State Council. Failing to pay in accordance with the provisions, it is deemed that the payment procedures have not been handled. In case of overpayment, re-payment or wrong payment, a refund request can be made to the patent administration department in the State Council within 3 years, and the patent administration department in the State Council will give a refund.