ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,535, issued on Aug. 26, was assigned to KOBELCO CONSTRUCTION MACHINERY Co. LTD. (Hiroshima, Japan).

"Turning unit of construction machine" was invented by Hidekazu Iwashita (Hyogo, Japan), Kenichi Terauchi (Hiroshima, Japan), Masatsugu Hamasaki (Hiroshima, Japan), Takamasa Abe (Hiroshima, Japan) and Yoshiki Kamon (Hyogo, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Formed inside a housing of a slewing unit are: an upper outer space located outside a piston in the radial direction, and at least one supply passage that guides, inward in the radial direction, a lubricant that has passed through a lower space, an outer passage, and an upper oute...