The authorization number of a patent is the patent number, which evolved from the application number.
At present, the application number consists of 13 digits, the first four digits are the year, the last digit is 1 or 2, 1 is the invention, 2 is the utility model, the last digit is the serial number, and the last digit is the efficacy digit.
After the patent application is authorized, the application number becomes the patent number, only a capital letter ZL is added in front of it.