ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,516, issued on Aug. 19.
"Energy-saving elevator" was invented by SeyedAliAlNaghi TabatabaeiSeyfi (Mashhad, Iran).
According to the abstract* released by the U.S. Patent & Trademark Office: "An energy-saving elevator. The energy-saving elevator includes an elevator car, a counterweight, a lift cable, and a hoist-type lifting mechanism. The hoist-type lifting mechanism includes a first adjustable pulley, a second adjustable pulley, and an adjustable cable interconnected between the first adjustable pulley and the second adjustable pulley. The first adjustable pulley includes a first fixed conical member with a first conical surface and a first moveable conical member with a second ...