ALEXANDRIA, Va., Feb. 5 -- United States Patent no. 12,215,481, issued on Feb. 4, was assigned to VOLVO CONSTRUCTION EQUIPMENT AB (Eskilstuna, Sweden).
"Construction equipment" was invented by Dongsoo Kim (Gyeongsangnam-do, South Korea) and Miok Kim (Gyeongsangnam-do, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is construction equipment including: an undercarriage; an upper swing body rotatably supported on the undercarriage; a work device supported by the upper swing body and comprising a boom, an arm and a bucket, which operate by means of respective hydraulic cylinders; a control valve for controlling the boom cylinder; an electronic proportional pressure reducing valve for control...