ALEXANDRIA, Va., June 16 -- United States Patent no. 12,309,890, issued on May 20, was assigned to Tanjing Keji (Guangdong) Co. Ltd (Guangzhou, China).

"Heating structure and a heating device applying it" was invented by Bin Hou (Guangzhou, China), Sheng Li (Guangzhou, China) and Bingang Tao (Guangzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The utility model relates to the field of electric heating and heat conduction technology, specifically to a heating structure and the heating device applying it. The heating structure comprises surface layer sequentially stacked and connected, heat-conducting insulating layer, heating film and thermal insulation layer. The heat generating film comprises an...