After entering "China Patent Inquiry System", click "Click to Enter" under public inquiry, and then select "Agree to the above statement" to continue.
Enter the patent name, query, and then click on the "Basic Information" of the patent, and you can see when the patent was granted, or withdrawn, or the patent has expired. There are generally three situations. If there are two announcement numbers under "Announcement of Invention/Authorization", the general patent is authorized. Details of the patent can be found under "Trading Announcement".
It is best to use the patent name when querying, and sometimes there are problems such as format when querying with application number or date.