ALEXANDRIA, Va., April 21 -- United States Patent no. 12,606,989, issued on April 21, 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: In a case where the hydraulic actuator A supplied with hydraulic oil only from the first hydraulic pump and the hydraulic actuator B supplied with hydraulic oil from the first and second hydraulic pumps are operated simultaneously, even if the required flow rate for the first hydraulic pump of the hydraulic actuators A and B exceeds the first hydraulic pump maximum discharge flow rate, the hydraulic ac...