ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,880, issued on March 3, was assigned to Hitachi Industrial Equipment Systems Co. Ltd. (Tokyo).
"Compressor" was invented by Tasuku Onodera (Tokyo) and Yoshio Kobayashi (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a compressor including a sliding material with the wear resistance improved. To solve this problem, a compressor (40) includes: a compression chamber (43) that is formed in a cylinder (41) and compresses gas; and a piston ring 421 and a rider ring 422 that are in contact with the inner wall of the cylinder 41 to form the compression chamber (43). The piston ring 421 and rider ring 422 include: a resin member; and a meta...