ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,880, issued on July 29, was assigned to Hitachi Construction Machinery Co. Ltd. (Tokyo).
"Work machine" was invented by Yoichi Kowatari (Kasumigaura, Japan), Shuuhei Kofuna (Tsuchiura, Japan) and Tomoaki Hayashi (Shinagawa-ku, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A work machine includes: a hydraulic actuator; a closed-circuit pump that is connected to the hydraulic actuator in a closed circuit, and supplies and discharges a hydraulic working fluid to and from the hydraulic actuator; an open-circuit pump that is connected to the hydraulic actuator in an open circuit, and supplies the hydraulic working fluid to the hydraulic actuator; ...