Calculation method of patent number check code

The calculation method of the patent number check code is based on the front part of the patent number, and the specific steps are as follows: 1. Convert the front part of the patent number (excluding the check code) into a number string, where letters are replaced by numbers, a stands for 10, b stands for 1 1, and so on, and then arrange the number strings from high to low. 2. Multiply these numbers by different coefficients, and the coefficients are 2, 3, 4, 5, 6 and 7 from left to right. The products add up to get the sum. 3. Divide this sum by 1 1 and take the remainder, which is the check code. 4. If the remainder is 10, the check code is X. For example, for the patent number CN 1234567, the calculation method of the check code is as follows: 1. Convert CN 1234567 into a number string, namely12141234567. 2. Arrange the number strings from high to low and get: 7 654 3211414121. Multiply these numbers by different coefficients and add them together, and the total is: (7× 2)+(6× 3)+(5× 4)+(4× 5)+(3× 6)+(2× 7)+(12)+(65438). 4. Divide the sum by 1 1 and take the remainder, which is:148mod1=1. 5. So the check code of CN 1234567 is 1, that is, CN 1234567 1 is the complete patent number.