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:
Dec. 10, 2019
Filed:
Jul. 14, 2016
Applicant:
Kabushiki Kaisha Riken, Tokyo, JP;
Inventor:
Yuji Shima, Kashiwazaki, JP;
Assignee:
KABUSHIKI KAISHA RIKEN, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J 9/22 (2006.01); F16J 9/26 (2006.01); F02F 5/00 (2006.01); C23C 8/38 (2006.01); C23C 8/50 (2006.01); C23C 22/22 (2006.01); C23C 8/26 (2006.01); C23C 8/80 (2006.01); C23C 28/04 (2006.01); C22C 21/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C23C 22/78 (2006.01); C23C 30/00 (2006.01); F02F 1/20 (2006.01);
U.S. Cl.
CPC ...
F16J 9/22 (2013.01); C23C 8/26 (2013.01); C23C 8/38 (2013.01); C23C 8/50 (2013.01); C23C 8/80 (2013.01); C23C 22/22 (2013.01); C23C 28/04 (2013.01); F02F 5/00 (2013.01); F16J 9/26 (2013.01); C22C 21/02 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C23C 22/78 (2013.01); C23C 30/00 (2013.01); F02F 1/20 (2013.01);
Abstract
To provide a piston ring free from microwelding to a piston while exhibiting excellent wear resistance in side surfaces, for a long period of use in a high-temperature, high-pressure environment, and its production method, a nitride layer is formed on at least one of upper and lower side surfaces of the piston ring, and then subjected to a phosphate chemical conversion treatment, such that the nitride layer has at least one of granular and vermicular surface forms.