ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,460,659, issued on Nov. 4, was assigned to KOMATSU LTD. (Tokyo).
"Hydraulic cylinder" was invented by Koutaro Asano (Tokyo), Keisuke Tasaki (Tokyo) and Yuki Ikezawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydraulic cylinder includes a cylinder tube, a piston rod that has a rod end portion disposed inside the cylinder tube and moves in an axial direction, a first rod passage that is formed inside the piston rod and connects a hydraulic source and a first opening formed in the rod end portion, a plug that is inserted into the first rod passage through the first opening, and a piston that is fixed to the piston rod in a state of covering at ...