ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,733, issued on March 25, was assigned to HD HYUNDAI INFRACORE Co. LTD. (Incheon, South Korea).
"Construction machine" was invented by Byung Il Kang (Incheon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is related to a construction machine, the construction machine including: a main pump; a swing motor operated by the main pump; a swing valve configured to control flow of the hydraulic oil by the main pump to supply the hydraulic oil to the swing motor and to control the flow of the hydraulic oil having been discharged from the swing motor; a hydraulic oil control valve unit configured to control the flow of the ...