Patent publications or announcement documents will have a number, which has four parts: the first part is the country code CN of China, and the second part is 1 bit, representing the type of patent application. The third part is the 2nd-9th digits, representing the serial number. The fourth part is the type identification code of the patent document, which is the letter at the end, where A stands for the disclosure of the application for invention patent, B stands for the announcement of the authorization of invention patent, U stands for the announcement of the authorization of utility model patent, and S stands for the announcement of the authorization of design patent.
Patent literally refers to exclusive rights and interests.