After the application, the patent number will reflect the type of the patent. Since 2004, the basic format of patent number is 20021000001.1,and the first paragraph of 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 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.