Patent application number is important information for identifying and retrieving patent documents, and its format and meaning can be understood from the following aspects:
1.** Country code: * * The beginning of the patent application number usually contains the code representing the country or region. Different countries have different codes, for example, the United States is US and China is CN.
2.** Year: * * The following figures usually indicate the year when the patent application was filed. This helps to determine the time of patent application.
3.** Category code: * * The patent application number of some countries contains the category code, indicating the technical field to which the patent belongs. These codes are usually a combination of letters and numbers.
4.** serial number: the number after the year and category code is the serial number of the patent. The serial number increases in the order of application.
5.** Check bit: * * Some patent application numbers contain a check bit to verify the validity of the application number. The parity bit is usually a number or a letter.
For example, the application number format of China patent is CNYYYYNNNNNN, where YYYY stands for year and NNNNNN stands for serial number.
When reading the patent application number, you can identify and understand the information according to the above points. This is helpful to obtain the basic information of patent quickly and provide convenience for the follow-up patent inquiry and research.
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