All kinds of fees paid to the Patent Office shall be marked with the correct application number, short name of fees and itemized amount, and those that are not marked shall be regarded as not having gone through the payment procedures. Therefore, please be sure to write down the correct application number, the short name of the fee and the itemized amount in the remittance information. If the annual fee is not paid on time (except the authorized annual fee) or the amount paid is insufficient, it can be paid back within six months from the date of expiration of the annual fee, and the late payment fee can be paid at the same time; The amount of the late payment fee is calculated by adding 5% of the full annual fee of the current year for every 1 month that exceeds the prescribed payment time; If the overdue payment time exceeds the prescribed time limit but is less than one month, the late payment fee will not be paid. If it is overdue for more than one month, a late fee of 5% of the annual fee will be added, with a maximum of 25%. If it is not paid at the expiration of the time limit, the patent right shall be terminated from the date of paying the annual fee.
Legal basis: Detailed Rules for the Implementation of People's Republic of China (PRC) Patent Law.
Article 97 When going through the registration formalities, the applicant shall pay the patent registration fee, the printing fee for the announcement and the annual fee for the year when the patent right is granted. Failure to pay or pay in full at the expiration of the period shall be deemed as failure to go through the registration formalities.
Article 98 The annual fee after the year in which the patent right is granted shall be paid before the expiration of the previous year. If the patentee fails to pay or fails to pay in full, the patent administration department of the State Council shall notify the patentee to pay the annual fee within 6 months from the date of expiration, and pay the late fee at the same time; The amount of the late payment fee is calculated by adding 5% of the full annual fee of the current year for every 1 month that exceeds the prescribed payment time; If it is not paid at the expiration of the time limit, the patent right shall be terminated from the date when the annual fee should be paid.