ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,184, issued on Dec. 23, was assigned to velit cooling & heating. LLC.

"Ventilation rooftop air-conditioning system" was invented by Xiaoyue Zhou (Issaquah, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ventilation rooftop air-conditioning system includes a housing unit, an air blower unit and an air-conditioning unit, wherein the housing unit includes a main body and a lid body, and a fixing element is disposed in the interior of the main body, and the interior of the main body is divided into a circulation channel and a ventilation channel by the fixing element, and an evaporator is disposed on the fixing element; wherein the ventilation r...