(1) First enter official website, China National Intellectual Property Administration, and click "Patent Search Query" in the menu bar above. After entering, click "China Patent Inquiry System" again.
(2) After entering "China Patent Inquiry System", click "Click to Enter" under public inquiry, and then select "Agree to the above statement" to continue.
(3) Enter the name of the patent, make a query, and then click on the "Basic Information" of the patent to see when the patent has been authorized, withdrawn or expired.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".