2. Patent number: After the patent applicant obtains the patent right, the patent number on the patent certificate issued by China National Intellectual Property Administration is ZL (patent initials)+application number.
3. According to Baidu's current understanding of users, the number of inquiries about patent numbers is increasing day by day, which proves that people pay more and more attention to the authenticity of patent numbers, and the patent numbers in China are basically divided into the following two situations.
4. The patent number before 2004 is divided into four sections: for example, 97 10 1765.4.
(1) is the first two digits, indicating the year when the patent application was filed. For example, 97 represents the application submitted in 1997.
(2) It consists of the third digit, indicating the type of patent application, and 1 indicates invention (if 2 indicates utility model, 3 indicates design, and 8 indicates PCT invention patent application and 9PCT utility model patent application).
(3) It consists of the fourth to eighth digits, indicating the serial number of such applications in the current year. For example, 0 1765 indicates the application of the current year 1765.
(4) It consists of the ninth digit or symbol, which is a check bit automatically generated by the computer. Is the remainder obtained by sequentially multiplying the first eight bits by 2, 3, 4, 5, 6, 7, 8 and 9, adding their products, and then dividing them by 1 1. When the remainder is equal to or greater than 10, the calculation method for calculating the last digit is 9× 2+5× 3+14+15+5× 6+6× 7+0× 8+8× 9 =186. Divide 186 by 166.