ALEXANDRIA, Va., May 12 -- United States Patent no. 12,624,844, issued on May 12, was assigned to KYUNGDONG NAVIEN Co. LTD. (Pyeongtaek-si, South Korea).
"Air heating apparatus" was invented by Jun Kyu Park (Seoul, South Korea) and Dong Hwan Kim (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 that preserves water, a water heater that receives heat from a combustion gas generated through a combustion reaction to heat the water, a heating heat exchanger that receives the water heated by the water heater and exchange heat with air that is to be discharged for heating, a fan that sends the air to the heating heat exchanger, a ci...