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

"Provisions on the Marking Methods of Patent Marks and Patent Numbers"

According to the "Patent Law of the People's Republic of China" and the "Implementing Rules for the Patent Law of the People's Republic of China" "Relevant regulations of "Patent Marks and Patent Numbers" are specially formulated, which will come into effect on July 1, 2003.

Article 4 If the patent mark and patent number are marked, the following content shall be marked:

(1) Use Chinese to indicate the category of patent rights, such as Chinese invention patents and Chinese utility models. Patents, Chinese design patents;

(2) The patent number granted by the State Intellectual Property Office, where "ZL" means "patent", and the first and second digits indicate 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.

Extended information

"Provisions on the Marking Method of Patent Marks and Patent Numbers"

Article 5 In the case of products directly obtained according to patented methods or the packaging of such products If the patent mark and patent number are marked on the product, it should be indicated in Chinese that the product is a product obtained according to a patented method.

Article 6: The patent management departments of local people's governments are responsible for supervising and managing the marking of patent marks and patent numbers within their respective administrative regions.

Article 7: If the patent mark or patent number annotation does not comply with these regulations, the department managing patent work may require it to make corrections within a time limit.

If the patent mark or patent number is improperly marked, which constitutes patent counterfeiting, the patent administration department shall impose penalties in accordance with Article 59 of the Patent Law.

Baidu Encyclopedia--Provisions on how to mark patent marks and patent numbers