Trademark and patent processes are basically the same. First, Party A and Party B must draft an agreement and then notarize it. Then the trademark will be filled in according to the requirements of some relevant documents of the Trademark Office, and submitted together with the notarized documents of the transfer, and the patent will be submitted to the Patent Office for transfer! Specific documents, you can find an agency to help you get it!
I hope I can help you, welcome to ask and hope to adopt.