The national patent number needs to be inquired in China National Intellectual Property Administration.

In China National Intellectual Property Administration, the steps for inquiring the patent number are as follows:

1. Click on the search result entry to enter the webpage of China National Intellectual Property Administration.

2. On China National Intellectual Property Administration's web page, click on the patent examination information query.

3. Enter your account and password, and then click Login.

4. After logging in, enter the patent number to be queried.

5. Click the search icon to complete the search.