What is the change certificate of the patent applicant?

The change certificate of the patentee is the document provided by the patentee when it changes. Where the patent applicant or patentee changes the patent applicant or patentee due to the transfer or donation of rights, the original or notarized copy of the transfer or donation contract must be submitted; When a contract is concluded by a legal person, it must be signed or sealed by the legal representative or authorized person, and stamped with the legal person's official seal or special seal for the contract; Submit notarized documents when necessary.