ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,410,808, issued on Sept. 9, was assigned to MITSUBISHI HEAVY INDUSTRIES LTD. (Tokyo).
"Crude oil extraction pump" was invented by Kimihiko Mitsuda (Tokyo) and Shuhei Sasaki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A crude oil extraction pump includes: a production pipe having a tubular shape along an axis extending in a vertical direction; a pump rotor extending in a direction of the axis inside the production pipe; and a pump stator surrounding the pump rotor, wherein the pump rotor includes a pump shaft and an impeller which is provided in multiple stages and rotates together with the pump shaft to pump crude oil upward, and wherein the ...