How can I know whether the patent is developed by myself or jointly through the patent inquiry system? If it is cooperative research and development, how to query and create information?

Through the website of the State Patent Office, you can find:

1, applicant information (single or multiple applications)

2. Name and address of the applicant

3. All technical data of the patent

4. Name of inventor

If you can't find anything else, as far as the cooperative research you mentioned is concerned, if it is a cooperative research, it is also possible that the applicant is a person.

You Baidu "China Intellectual Property Office", enter official website, enter the inquiry column (in the middle position on the right side of the website), click the accurate inquiry, enter the patent number, and you can consult the relevant information.