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:
Jan. 03, 2012
Filed:
Aug. 22, 2008
Applicants:
Tomotaka Kariya, Saitama, JP;
Etuo Tamegai, Saitama, JP;
Hiromi Ishikawa, Saitama, JP;
Makoto Tsuruta, Yokohama, JP;
Inventors:
Tomotaka Kariya, Saitama, JP;
Etuo Tamegai, Saitama, JP;
Hiromi Ishikawa, Saitama, JP;
Makoto Tsuruta, Yokohama, JP;
Assignees:
Nippon Piston Co., Ltd, Saitama, JP;
STT Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/02 (2006.01); B32B 3/10 (2006.01); B32B 15/04 (2006.01); B32B 15/08 (2006.01); B32B 15/088 (2006.01); 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 has a most outside surface layer including a heat-resistant resin and a metal powder contained in the heat-resistant resin and a base bottom layer formed nearest the piston ring body and including a heat-resistant resin. The base bottom layer may also include a metal powder.