ALEXANDRIA, Va., July 3 -- United States Patent no. 12,345,019, issued on July 1, was assigned to Caterpillar SARL (Geneva).
"Hydraulic control system in working machines" was invented by Hideki Nakajima (Akashi, Japan), Koichi Kiyasu (Akashi, Japan) and Toshikazu Koga (Akashi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "In optional control circuit commonly used among multiple optional hydraulic actuators, it is necessary to enable back pressure reduction, part reduction, and downsizing when a breaker is mounted as an optional hydraulic actuator. A normal control region, where the discharge valve passage to the oil tank has an opening area of normal control range, and a back pressure reduction regio...