The first two digits indicate the year of patent application; The third digit indicates the category of the patent application (1 stands for invention patent, 2 stands for utility model patent and 3 stands for design patent), the fourth to eighth digits are serial numbers, and the last digit is the computer check code, which is a number from 0 to 9 or the letter x, where x stands for 10. That is to say, this patent is utility model patent No.46269 of application 1999, where x is obtained by multiplying the first eight digits by 2, 3, 4, 5, 6, 7, 8 and 9 in turn, adding the sum of their products and dividing by 1 1, and the remainder is 60. Namely: 9× 2+9× 3+2× 4+4× 5+6× 6+2× 7+6× 8+9× 9 = 252. 252 is divided by 1 1, and the remainder is 10.
How to specify the patent application number in 2000? The method is very simple, or use the above coding rules. For example, the patent application number of a composite template used in construction engineering is 00202432.2, where 00 represents the year of patent application, that is, 2000; 2 shows that the patent application is a utility model; 02432 is the serial number; The two digits after the decimal point are computer parity bits, which still follow the above calculation rules.