ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,502,026, issued on Dec. 23.
"Heating lunch box" was invented by Zhenfei Ou (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A heating lunch box includes a base and a food container. The food container is used for holding food. The base includes an outer shell, a circuit board, a first heating member, a second heating member, and an inner container. The circuit board, the first heating member, the second heating member, and the inner container are arranged inside the outer shell. The inner container is used for heat conduction. The first heating member and the second heating member are both electrically connected to the circuit board. A r...