Patent maintenance time refers to the actual time from the date of application or authorization to the date of invalidation, termination, revocation or expiration.
The patent laws of different countries or regions have different calculations of patent maintenance time. Some are calculated from the date of application, and some are calculated from the date of authorization. The patent maintenance time in my country is calculated from the date of patent application. The patent maintenance time mentioned in this article, unless explicitly stated, refers to the overall maintenance time of the patent, that is, macro data, and does not refer to the maintenance time of individual patents.