ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,910, issued on Feb. 24, was assigned to Hitachi Construction Machinery Co. Ltd. (Tokyo).
"Work machine" was invented by Tarou Akita (Tsuchiura, Japan), Yoshihiro Shirakawa (Tsukuba, Japan), Kohei Ogura (Tsuchiura, Japan) and Mitsuhiko Kanehama (Kasumigaura, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A work machine includes a flow control valve that controls a flow rate of a hydraulic fluid supplied to a hydraulic actuator, a center bypass line that introduces the hydraulic fluid from a pump through a center bypass passage section of the flow control valve into the tank, a bypass cutoff valve that controls an opening of the center bypass li...