ALEXANDRIA, Va., June 9 -- United States Patent no. 12,650,243, issued on June 9, was assigned to KYUNGDONG NAVIEN Co. LTD. (Pyeongtaek-si, South Korea).
"Air heating apparatus" was invented by Jun Kyu Park (Seoul, South Korea) and Jae Sung Hong (Seoul, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is an air heating apparatus including an expansion tank which preserves water, a water heater which receives heat from a combustion gas generated through a combustion reaction and heats the water, a heating heat exchanger which receives the water heated by the water heater and exchanges heat with air that is to be discharged for heating, a fan which sends the air to the heating heat exchange...