ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,773, issued on May 27, was assigned to SUMITOMO CONSTRUCTION MACHINERY Co. LTD. (Tokyo).
"Excavator" was invented by Riichi Nishikawara (Chiba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An excavator includes an excavation attachment including a boom, an arm, and a bucket, a left main pump and a right main pump mounted on an upper rotating body, a control valve serving as a confluence valve that merges an operating oil discharged from the left main pump and the operating oil discharged from the right main pump with each other, and a controller that can control functioning of the control valve. The controller moves the control valve to merg...