What is the time limit for paying the patent registration fee?

When will the annual patent fee be paid? The annual patent fee shall be paid according to the date of application. The annual fee for the year in which the patent right is granted shall be paid within the time limit specified in the notice of granting the patent right issued by the Patent Office, and the annual fee thereafter shall be paid in advance within one month before the expiration of the previous year. If the payment is not made within one month before the expiration, the Patent Office will grant a grace period of one month. If the fee is not paid within one month after the expiration, a late fee will be incurred.