ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,448, issued on Feb. 17, was assigned to DELTA ELECTRONICS INC. (Taoyuan, Taiwan).
"Impeller wheel" was invented by Shun-Chen Chang (Taoyuan, Taiwan) and Chin-Cheng Tsao (Taoyuan, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An impeller wheel includes a top ring, a bottom disc, and a plurality of fan blades. The inner edge of the top ring surrounds an air inlet. The top ring has a curved structure. The inner edge of the bottom disc surrounds an opening. The bottom disc has a curved structure. The fan blade has a front edge, a top edge, a rear edge, and a bottom edge. The top edge and the bottom edge are fixed to the top ring and the bottom d...