Patent certificate is a legal document issued by the patent office to the patent applicant after the patent application has passed the examination. The patent certificate records the name of the invention-creation, the name of the applicant for the invention-creation, the starting date of the patent right, the application number and the patent number.
With a patent certificate, it proves that the patent belongs to you. If others want to use it, they must get your permission and pay you a fee. Otherwise, it is patent infringement, and the infringer can be prosecuted.