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. 12, 1995
Filed:
Mar. 08, 1994
Applicant:
Inventors:
Satomichi Miyazaki, Okaya, JP;
Nobuyuki Yamashita, Shiojiri, JP;
Shoji Tanaka, Shiojiri, JP;
Hiroto Fukutome, Okaya, JP;
Hiroshi Tamagaki, Kobe, JP;
Assignees:
Teikoku Piston Ring Co., Ltd., Tokyo, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; H01R / ;
U.S. Cl.
CPC ...
428217 ; 428472 ; 4284721 ; 428689 ; 428698 ; 428702 ; 29888074 ; 427523 ; 427528 ; 427530 ; 1062861 ;
Abstract
A hard film 2 is applied to cover an outer circumferential surface of a piston ring 1 by an ion plating process. Either 3 percent to 20 percent by weight of oxygen, or 2 percent to 11 percent by weight of carbon is included in a solid solution state in a crystal structure of CrN in the hard film 2. The Vickers hardness of the hard film 2 is in a range of 1600 to 2200.