ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,160, issued on Oct. 14, was assigned to KOMATSU LTD. (Tokyo).
"Hydraulic system, excavator, and control method of excavator" was invented by Wataru Sumino (Tokyo), Daisuke Kozuka (Tokyo), Akira Hasebe (Tokyo) and Masatoshi Ikeda (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A control method of an excavator including: a first circuit of an open circuit including a main valve controlling inflow of hydraulic oil from a main pump to a working equipment cylinder, and a tank to which the oil flowed out of the cylinder is ejected via the main valve; a second circuit of a closed circuit including a first valve between swing pump and motor; and a sec...