ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,728, issued on Oct. 7, was assigned to MITSUBISHI ELECTRIC Corp. (Tokyo).
"Turbofan and air-conditioning apparatus" was invented by Ryutaro Asano (Tokyo), Tomoya Fukui (Tokyo), Kazuki Isomura (Tokyo) and Makoto Kurihara (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a turbofan, a first curve, formed by projecting a leading edge onto a plane perpendicular to a rotating shaft, has a first inflection point and has a portion that is convex at a point closer to the first inflection point than the first point is in a counter-rotational direction and a portion that is convex at a point closer to the second point than the first inflection point is ...