First, fill in a declaration form describing the project change, which can be downloaded from the national patent website. Then you have to sign a patent transfer contract with the person, company or unit that has obtained your patent right. The contract must indicate a series of names such as patent name, patent number and patentee. You can search Baidu, there are many templates.
Then go to the patent office with the materials, and each piece needs to pay the handling fee of 200 yuan.