What does the number of the patent number mean? What are the formal patent identification formats?

The patent application number is the "ID number" of the patent, which is unique and used to distinguish it from other patents. After the patent application is authorized, mark "ZL" before the application number, which is the patent number of the patent.

The patent application number consists of three parts: year number, patent application type number and serial number. For example, the patent application number is 200820 183488.6, and the first four digits of 2008 are the year numbers, indicating that the patent was applied in 2008. The second digit after the year number is the patent category number, indicating that the patent application is a utility model. The number after is the sequence number, and the number after the decimal point is the check code. Before 2003, the patent number was double digits, such as 02 14 1440.8, and 02 was in 2002.

There are three common patent classification numbers: 1 stands for invention patent; 2 stands for utility model patent; 3 stands for design patent. There are also two kinds: 8 means that the PCT invention patent application has entered the national stage in China; 9 denotes the PCT utility model patent application that entered the national stage in China.