ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,069, issued on May 27, was assigned to Hitachi Industrial Equipment Systems Co. Ltd. (Tokyo).
"Screw compressor" was invented by Shuhei Nagata (Tokyo), Shigeyuki Yorikane (Tokyo), Kenji Morita (Tokyo), Yuta Kajie (Tokyo) and Kotaro Chiba (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A screw compressor has first and second screw rotors that suck, compress, and deliver a working medium; a first bearing supporting one end of the first screw rotor coupled to a rotating shaft of a power source; a casing housing the first screw rotor and first bearing; a shaft-sealing member located on an opposite side of a tooth profiler for the first screw rotor...