After the patent application is authorized, when the patent applicant goes through the registration procedures, in addition to paying the patent registration fee, he should also pay the annual fee for the year when the patent right is granted. And every year in the future, the annual fee for the next year must be renewed one month before the expiration of the previous year. Sometimes I forget to pay the annual fee for various reasons. In this case, can I pay it back? If I make a back payment, are there any other handling fees? Regarding this issue, the editor of Zhifuzi makes the following analysis: I forgot to pay the patent annual fee. Do I need to pay a handling fee to make up the payment? If the payment is not made within the prescribed time or the payment amount is insufficient, the fee can be paid within 6 months from the expiration date of the annual fee. Additional payment within the month. Along with the supplementary payment, you also need to pay a late fee, otherwise you will lose your patent rights! The amount of late payment fee is calculated as follows: 1. If the stipulated period is exceeded for 1 day to 1 month (including 1 full month), only the annual fee is required to be paid, and no late fee is required; 2. The stipulated period is exceeded for 1 month to 2 months month (including 2 whole months), the amount of late payment fee to be paid is 5% of the full annual fee; 3. If the specified period exceeds 2 months to 3 months (including 3 whole months), the amount of late payment fee to be paid is 5% of the full annual fee; 10% of the full annual fee; 4. If the stipulated period is exceeded for 3 months to 4 months (including 4 full months), the amount of late payment fee to be paid is 15% of the full annual fee; 5. If the stipulated period is exceeded for 4 months to For 5 months (including 5 full months), the amount of late payment fee to be paid is 20% of the full annual fee; 6. For 5 to 6 months (including 6 full months) beyond the prescribed period, the amount of late payment fee to be paid 25% of the full annual fee.