US Patent Issued to Hitachi on July 14 for "Screw compressor" (Japanese Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,545, issued on July 14, was assigned to Hitachi Ltd. (Tokyo).

"Screw compressor" was invented by Hironobu Kawamura (Tokyo), Sachio Sekiya (Tokyo), Hiroshi Maita (Tokyo), Haruki Nukaga (Tokyo) and Kento Hashimoto (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A screw compressor includes a first seal, a second seal, and a third seal which are non-contact seals from a rotor side to a bearing side of a shaft seal portion, a compressed gas supply device which is different from a rotor that supplies compressed gas between the first seal and the second seal, and a heating device that heats the compressed gas supplied between the first seal and the s...