If a patent agency is entrusted to apply for a patent, it is not necessary to issue a power of attorney for patent registration and obtaining a patent certificate. When the patent application can be authorized after examination, the State Information Bureau will inform you to apply for patent registration through a patent agency. At this time, the agency will tell you about it and then take the initiative to do it, unless you know about it, and explicitly instruct the agency not to register.
Do you want to apply for patent registration and get a patent certificate through a third party other than the agency entrusted before?