What is the patent number based on?

Significance of patent number: There are more and more inquiries about patent number, which proves that people pay more and more attention to the authenticity of patent number. Patent numbers in China are basically divided into the following two situations: \ x0d \ 2002 patent numbers before 2002, which are divided into four sections: for example, 97 10 1765.4. The first paragraph is the first two, indicating the year when the patent application was filed, such as "97. The second paragraph consists of the third digit, indicating the type of patent application, and "1" indicates invention (if it is utility model "2", design "3", PCT invention patent application "8" and PCT utility model patent application "9"); The third paragraph consists of the fourth to eighth digits, indicating the serial number of this kind of application in the current year, for example, 0 1765 indicates the application in the current year 1765; The fourth paragraph consists of the ninth digit or symbol, which is a check bit automatically generated by the computer. It can be any number or character x between 0 and 9, such as "4" in this example. \x0d\ Since 2002, the basic format of patent number is 2002100001.1. \ x0d \ 2002 The first paragraph is 2002; The second paragraph consists of the fifth digit, indicating the application type; The third paragraph consists of the sixth to twelfth digits, representing the application serial number of that year (the increase in figures represents the increase in the number of applications in recent years, which is really gratifying and encouraging; On the other hand, it has indeed increased the workload and extended the time for the Intellectual Property Office); The fourth paragraph consists of the last digit or symbol, which is a check bit automatically generated by the computer and given by the computer. The patent number of the patent that has been authorized, that is, the patent number on the authorization certificate issued by China National Intellectual Property Administration, is the application number in front of ZL. For example, the patent number granted by XXX is ZL2003 10 100002.