How to inquire whether it is a patented product?

Patents include application number, name, patentee and so on. You can inquire about one of these three pieces of information, and there are many inquiry channels, which can be found in official website, China National Intellectual Property Administration, while official website's inquiry can only be found in China and transnational patent information inquiry online by registering and logging in. There are also many private websites that can be found, some of which are free and some are charged. It is not excluded that some of them can't be found. Generally speaking, as long as it is public, it can be found.