ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,429,238, issued on Sept. 30, was assigned to KYUNGDONG NAVIEN Co. LTD. (Pyeongtaek-si, South Korea).
"Air heating apparatus" was invented by Jae Sung Hong (Seoul, South Korea) and Kwang Jae Lim (Seoul, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "An air heating apparatus includes an expansion tank that stores water, a water heating device that receives heat from combustion gas generated by a combustion reaction and heats the water, a heating heat exchanger that receives the water heated by the water heating device and conducts heat exchange between air to be released for heating and the water, a fan that supplies the air to the heating he...