The patent number * * * has 13 digits, the first four digits are the year, the fifth digit 1 stands for the invention patent, and the last digit is the check code.
Application year number+patent application type+application serial number
A digit after the year indicates the type, 1 is an invention, 2 is a utility model, 3 is a design, 8 is an invention applied for by PCT, and 9 is a utility model applied for by PCT.
The last 5 digits are the application serial number.
The number after the decimal point is the check code of the computer, which is the remainder obtained by multiplying the first eight bits 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 greater than or equal to 10, it is represented by X.
For example, the drainage device of Yangzi refrigerator has patent number ZL8820 1465. X, that is, this patent is 1465 utility model patent with application number 1988.
Make up several patent numbers. 2008 1 2039483.9 is an invention patent filed in 2008. Because it usually takes three years to authorize an invention patent, there will definitely be no authorization in 2009, so it will not constitute infringement if it is used more at this time.
93 2 34758.x is a utility model patent filed by 1993. Because the design patent only protects 10 years and expires in 2003, it will definitely expire in 2009. You can use it as you want, and it is impossible to infringe.
99 3 38485.0, 1999 applied for the design patent, which will expire in 2009. When you see this 3, you should know that the product is only an application for a design patent, not that the patented product has unique special functions. Even in many cases, the so-called design product only applied for the design patent of the product packaging box, and the product itself has not changed.