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:
May. 22, 2012
Filed:
Aug. 22, 2008
Applicants:
Etuo Tamegai, Saitama, JP;
Hiromi Ishikawa, Saitama, JP;
Tomotaka Kariya, Saitama, JP;
Makoto Tsuruta, Yokohama, JP;
Inventors:
Etuo Tamegai, Saitama, JP;
Hiromi Ishikawa, Saitama, JP;
Tomotaka Kariya, Saitama, JP;
Makoto Tsuruta, Yokohama, JP;
Assignees:
Nippon Piston Ring Co., Ltd., Saitama, JP;
STT Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 9/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
A piston ring includes a piston ring body and a surface coating film formed on at least one of upper and lower surfaces of the piston ring body. The surface coating film comprises a heat-resistant resin and a metal powder contained in the heat-resistant resin, and a phosphate coating film is formed, as base coating film of the surface coating film, on a surface on which the surface coating film of the piston ring body is formed.