Application year number+patent application type+application sequence number+computer check bit.
The first four digits indicate the application year, and the fifth digit indicates the application type:
1= application for invention patent
2= utility model patent application
3= Application for patent for design
8= PCT invention patent application entered the national stage in China.
9= PCT utility model patent application entered the national stage in China.
For example: 2003 1 0 100002. X stands for invention patent application.
2003 2 0 100002.5 represents an application for a patent for utility model.
200330 1000 1.6 represents an application for a patent for design.
2003 8 0 100002.X PCT invention patent application entered the national stage in China.
2003 9 0 100002.X PCT patent application for utility model entered the national stage in China.
From the date when the patent application documents are submitted to the Patent Office (the filing date), the Patent Office assigns a patent application number;
When an invention patent is published after preliminary examination, the patent office shall provide the patent publication number;
When the patent is authorized to be announced, the Patent Office shall provide the patent announcement number (similar to the patent announcement number;
When a patent is granted, the patent office provides the patent number (similar to the patent application number, usually preceded by a ZL).