What is the difference between a patent agency and a patent agency?

Patent agencies are agencies of the State Intellectual Property Office in various places responsible for patent applications and other matters.

Patent agencies, generally called patent agencies or agencies, are the recipients of applicants. Entrusted to act on behalf of the applicant to contact the State Intellectual Property Office responsible for patent applications and other matters

To put it simply, the agency is the official agent, and the agency is the applicant’s agent.