What about the patent of the National Knowledge Bureau? Have you installed the plug-in it says?

The files downloaded by China National Intellectual Property Administration are only in picture format and need to be downloaded page by page, which is very troublesome. I suggest you use soopat and Baten. Download the patent in pdf format. Generally speaking, patents that have been published for some time can be downloaded from these two websites. I often use white rattan. Com, you can download it without logging in, and the file is smaller than that downloaded by soopat. If you just consider downloading from the website of the Intellectual Property Office, try another IE browser.