ALEXANDRIA, Va., July 16 -- United States Patent no. 12,359,667, issued on July 15, was assigned to HITACHI INDUSTRIAL EQUIPMENT SYSTEMS Co. LTD. (Tokyo).
"Screw compressor" was invented by Shota Tanimoto (Tokyo), Kohei Sakai (Tokyo) and Toshiaki Yabe (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A male rotor of a screw compressor has a cooling flow path extending in an axial direction inside a discharge-side shaft section. A groove structure is provided at at least a part of a region on a wall surface of the cooling flow path between the position of a discharge-side end face of the male rotor and a mounting position of a discharge-side bearing. The groove structure includes grooves or a groove that ...