How to renew the annual patent fee?

Legal analysis: Pay the annual patent fee after patent application: The annual fee is paid from the date of patent application to the same day of the following year, and one year is called one year. From the date of application, the current year is the first year and the following year is the first year. The annual fee shall be paid within one month before the due date.

Legal basis: Article 6 of the Detailed Rules for the Implementation of China's Patent Law, the first day of various time limits stipulated in the Patent Law and the Detailed Rules for the Implementation is not counted in the time limit. If the term is calculated in years or months, the expiration date shall be the corresponding day of the last month; If there is no corresponding day in the month, the last day of the month shall be the due date.