Before checking the patent information of a product on Amazon, you must first confirm whether the product is protected by patent technology. To check whether a product on Amazon is patented, you can search the patent database on the website of the United States Patent and Trademark Office (USPTO), which includes patent information on products on Amazon. In addition, you can also search Google Patents online, which includes patent data from all over the world, including the United States, Canada, Europe, Japan, etc., including product patent information on Amazon. In addition, you can also use other third-party websites to search whether there are patented products on Amazon, such as Patentlens, Patentsview, Patentscope, etc. Finally, if you need to obtain more detailed information, you can also send a query to the patent office to obtain more detailed patent information.