Application year number+patent application type+application sequence number+computer check bit.
The first four digits indicate the application year, and the fifth digit indicates the application type:
1= application for invention patent
2= utility model patent application
3= Application for patent for design
8= PCT invention patent application entered the national stage in China.
9= PCT utility model patent application entered the national stage in China.
PatentNo.: zl20 1238899429.2, which means that the first four digits are the application year number, that is, 20 12 is applied; The fifth place is the type of patent application, 1 is an invention, 2 is a utility model and 3 is a design, so it is a design patent. 8899429 is the application serial number; The number after the decimal point is the computer check code, which is the remainder obtained by multiplying the last eight digits of the application year number by 2, 3, 4, 5, 6, 7, 8 and 9 respectively and then dividing by 1 1. If it is greater than 10, it is represented by X.