ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,410,588, issued on Sept. 9, was assigned to Caterpillar SARL (Geneva).
"Hydraulic control system in working machine" was invented by Hideki Nakajima (Akashi, Japan) and Koichi Kiyasu (Akashi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "PROBLEM: To avoid the pressure of the actuator oil passage from becoming higher or equal to the upper limit pressure that is set depending on an individual option hydraulic actuator, during non-operation of an option operation lever, even if the actuator oil passage connected to the option hydraulic actuator is not provided with a variable relief valve. SOLUTION: It is configured to release the pressure of the a...