CN begins with WeChat official account, indicating that the patent application is being published or has been published, and may not be authorized.
So those with zl numbers generally have cn numbers, and those with cn numbers may not be authorized to own zl numbers.
Let's get this straight.
If you have a zl number, go to the National Intellectual Property Network for patent search and enter your zl number in the application number or patent authorization number. If it is correct, you will find all relevant information about this patent after it is published. WeChat official account begins with cn.
Similarly, in the advanced search of this website, you can find the patent by entering the cn number in WeChat official account. If the patent has been authorized, it will have zl number. If there is no authorization, it is not as good as zl number.
In fact, the number after zl is the patent application number, and adding zl after authorization is authorization.
This is the most genuine website in China National Intellectual Property Administration, but sometimes it is a little slow … patience …