US Patent Issued to KOBE STEEL on Dec. 23 for "Piston ring, piston ring assembly, and reciprocating compressor" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,072, issued on Dec. 23, was assigned to KOBE STEEL LTD. (Hyogo, Japan).

"Piston ring, piston ring assembly, and reciprocating compressor" was invented by Hirotaka Ito (Kobe, Japan), Yuya Murata (Kobe, Japan), Takumi Kitayama (Kobe, Japan) and Naofumi Kanei (Takasago, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A piston ring is a piston ring for use in an oil-free-type reciprocating compressor for compressing hydrogen gas, the piston ring containing thermoplastic polyimide as a main component and carbon fiber and/or graphite as an additive, and having a tensile strength of 90 MPa or more and a bending strength of 150 MPa or more."

The paten...