ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,762, issued on June 17, was assigned to Kawasaki Jukogyo K.K. (Kobe, Japan).
"Hydraulic drive system" was invented by Tomomichi Nose (Kobe, Japan), Hayato Kawasaki (Kobe, Japan), Hideyasu Muraoka (Kobe, Japan) and Nobuyuki Kinoshita (Kobe, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "This hydraulic drive system includes: a hydraulic pump capable of changing a discharge flow rate of a working fluid; a meter-in control valve that controls a meter-in flow rate of the working fluid flowing from the hydraulic pump to a hydraulic actuator; a meter-out control valve that is provided separately from the meter-in control valve and controls a meter-ou...