How to retrieve patents? How much is the official website of the National Patent Office? How to operate the retrieval specifically? Add 20 points if you are satisfied. Ha, please,

Log in to Baidu, enter: China National Intellectual Property Administration-Patent Search, and then click Baidu. When the webpage opens, you can click "China National Intellectual Property Administration-Patent Search" to enter. Fill in what you want according to the form on the web page, and you'd better click "Search" to find what you want.