The number of patents in China is basically divided into the following two situations:
1) The patent number before 2002 is divided into four sections: for example, 97 10 1765. The first two digits indicate the year when the patent application was filed, such as "97" indicating the application filed in 1997; 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.
2) Since 2002, the basic format of patent number is 2002 100000 1. 1, the first paragraph 2002 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 digits represents the increase in the number of applications in recent years, which is really gratifying and encouraging, and on the other hand, it really increases the workload of the Intellectual Property Office and prolongs the time); 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.