How to check whether a thing is a national patent?

If you need to inquire whether a product is a patent, you can provide the patent number to the National Knowledge Bureau or the Patents Search website to search for the patent.

Or check whether there is a patent according to the provided name.

Sure enough, there are related patents, and then look at the legal status of patents, effective or invalid; If you can't find a patent, it must be a fake and shoddy product.