The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2022
Filed:
Apr. 01, 2020
Applicant:
Kobe Steel, Ltd., Hyogo, JP;
Inventors:
Tomohiro Ootsuka, Takasago, JP;
Naofumi Kanei, Takasago, JP;
Assignee:
KOBE STEEL, LTD., Hyogo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 9/28 (2006.01); F04B 15/00 (2006.01); F16J 9/26 (2006.01); F04B 7/06 (2006.01);
U.S. Cl.
CPC ...
F16J 9/26 (2013.01); F04B 15/00 (2013.01); F16J 9/28 (2013.01); F04B 7/06 (2013.01);
Abstract
A piston ring is used for a reciprocating compressor. In the piston ring, polytetrafluoroethylene and polyetheretherketone or polyimide account for 50% or more by mass in total. The piston ring does not contain polyphenylene sulfide. The piston ring has a tensile strength within a range of more than 15 MPa and less than 100 MPa.