How to check whether the patent has changed the patentee?

For the inquiry method of national patent invention 1, log on to the website of China National Intellectual Property Administration or China Patent Network 2, click "Advanced Search" 3 in the patent search section on the right, enter known keywords, such as patent number or patent name or product, click the search button 4 to get all relevant patent search forms, and select a patent to enter the specific title page 5 of the patent. If you are prompted to install the plug-in, you will not be able to browse the manual. 6. Click the instruction manual button at the bottom of the patent number to enter the instruction manual page, where you can browse the specific content. 7. Click the Save button in the top line to select the download path, and then select OK to download successfully. Note: If you have already applied, you can follow the steps. If you haven't applied, you can't query.