I look for patents on websites such as Baiteng.com and China National Intellectual Property Administration. How to find the contact information of the required patent holder?

According to the content of the description item, the description item is the content on the first page of the patent document you retrieved, including the patent applicant, the applicant's address information, the inventor information, the agency information, etc.

It can be written directly according to the address information of the applicant in the description project.

If you record the information of the patent agency in the project, you can also find the telephone contact information of the patent agency directly online, and then contact the agency directly to inform your purpose. Generally speaking, the agency will not tell you the contact information of the patentee, but will tell the patentee your purpose. You can only tell your purpose and your contact information and wait for the patentee to contact you.

I wish you an early contact with the person you are looking for!