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, 1996
Filed:
Jun. 03, 1994
Applicant:
Inventors:
Satomichi Miyazaki, Okaya, JP;
Nobuyuki Yamashita, Shiojiri, JP;
Shoji Tanaka, Shiojiri, JP;
Hiroto Fukutome, Okaya, JP;
Hiroshi Tamagaki, Kobe, JP;
Assignee:
Teikoku Piston Ring Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; B32B / ;
U.S. Cl.
CPC ...
2772 / ; 428472 ; 428698 ;
Abstract
An under coating 2 and a hard film 3 are formed on the outer circumferential surface of a piston ring 1 by an ion plating process. The under coating 2 is composed of at least one of Cr, Cr.sub.2 N, and CrN. The hard film 3 is composed of a hard coating material containing 3 percent to 20 percent by weight of oxygen in a solid solution state in a crystal structure of CrN and having the Vickers hardness of 1600 to 2200.