China's country code CN combined with the patent application number indicates that the patent application was accepted by China National Intellectual Property Administration, China. CN code should be located before the patent application number. If necessary, a single-byte space of 1 bit can be used between CN and the patent application number.
The patent application number is represented by 12 digits, including the application year number, application category number and application serial number. In order from left to right.
1- 4 in the patent application number indicates the year when the patent application was accepted, the fifth indicates the type of the patent application, and the sixth-12 (***7) indicates the serial number of the application, indicating the relative order of accepting the patent application. Every Arabic numeral used in the patent application number is decimal.
Extended data:
Rules for the use of patent application number 1: Joint use of patent application number and check bit.
China National Intellectual Property Administration gave the patent application number and check bit when accepting the patent application. The check bit is located after the patent application number, and the subscript single-byte real dot symbol is used as the separator between the patent application number and the check bit.
Unless otherwise provided by laws, regulations and administrative rules, the patent application number and the check bit (including the separator between them) are used together in various legal procedures stipulated in the Patent Law, the detailed rules for the implementation of the Patent Law and other relevant provisions.
Rule 2: Joint use of patent application number and China country code CN.
China country code CN can be used in combination with the patent application number to indicate that the patent application was accepted by China National Intellectual Property Administration, China. CN code should be located before the patent application number. If necessary, a single-byte space of 1 bit can be used between CN and the patent application number.
Rule 3: Writing and printing format of patent application number.
Unless laws, regulations and administrative rules stipulate that all digits of the patent application number (including digits combined with check digits) must be written or printed continuously, 1 single-byte space can be used between the year number and classification number of the patent application number and between the classification number and serial number respectively.
In the numeric fields representing years and serial numbers, spaces shall not be used between serial numbers and spacers, or between spacers and parity bits. Any other words, numbers, symbols or spaces other than those specified in rules 1, 2 and 3 shall not be used as part of the patent application number before, after or in the patent application number (including in combination with check bits).
Baidu encyclopedia-patent application number