How to inquire whether a patent exists?

The method of inquiring whether a patent exists is as follows:

Tools: ASUS Ling Yao S2, windows 1 1, Google Browser 1 1.9.0.6.

1. First, you need to log on to the official website of China National Intellectual Property Administration.

2. Find the patent search in the column of government services.

3. After clicking, read the disclaimer carefully and confirm the agreement, and click Agree.

4. Choose different retrieval methods according to your own requirements, and enter the key information of the patent to be retrieved in the input box.

3. Enter it and click Query to display all the query results.