What symbol is used to represent a patent?

Patents do not have special symbols, but are represented by patent numbers. The letters ZL represent patents.

"Regulations on the Marking Method of Patent Marks and Patent Numbers": When marking patent marks and patent numbers, the following content shall be marked

(1) Use Chinese to mark the category of patent rights, such as Chinese invention patents, Chinese utility model patents, and Chinese design patents;

(2) The patent number granted by the State Intellectual Property Office, in which "ZL" means "patent", and the first and second digits Indicates the year when the patent application was submitted, the third digit indicates the patent category, and the fourth and subsequent digits are the serial number and computer check digit.

In addition to the above content, the annotator can add other text and graphic marks, but the additional text, graphic marks and the way they are marked must not mislead the public. Read the patent number! Application year number Patent application type The first 2 digits of the application sequence number indicate the application year number. The third digit:

1= Invention patent application

2= Utility model patent application

3= Design patent application

8= PCT invention patent application entering the Chinese national stage

9= PCT utility model patent application entering the Chinese national stage.

The last 5 digits are the application sequence number.

The one digit after the decimal point is the computer's check code. The first 8 digits are multiplied by 2, 3, 4, 5, 6, 7, 8, and 9 in sequence, and their products are added together. Add the sum and divide by 11 to get the remainder. When the remainder is greater than or equal to 10, it is represented by x.

For example, the patent number of Yangzi refrigerator liquid discharge device is ZL88201465.X, which means that the patent is the 1465th utility model patent applied for in 1988.