Teach you how to search. Look it up yourself.
Website recommendation, official website, China National Intellectual Property Administration. You can directly search China National Intellectual Property Administration in Baidu, and then click official website. Click on the patent search to enter the page.
Just follow the steps of the website to register an account yourself. Free use. Then, it can be used normally.
On the home page, that is, the search page, enter the name of the company you want to search in the applicant's right holder, and then you can retrieve the results.
You can also limit other conditions, such as classification number, such as application time and so on. You can also learn retrieval skills seriously.
Good luck.