Among them, the first two digits of the first eight decimal places indicate the year of patent application;
The third digit indicates the category of the patent application. 1 is an invention, 2 is a utility model, and 3 is a design;
The fourth to eighth digits represent the serial number of this kind of patent application in that year;
The number after the decimal point is the computer check number, which is the remainder 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 then dividing by 1 1.
When the remainder is 10, it is represented by X. For example, the patent number of the drainage device of Yangzi refrigerator is ZL8820 1465. X, namely 1465 utility model patent with patentNo. 1988, where the value of X is as follows: 8× 2+8× 3+2.
Therefore, if the following problems are found in the patent number marked on the goods, they can be identified as counterfeit patented products with forged patent numbers: ① the patent number is incomplete; ② The first two digits of the patent number are less than 85; ③ The third digit is a number other than 1, 2 and 3; (4) One digit after the decimal point is a number that is inconsistent with the calculation result of the calculation method introduced earlier.