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. 31, 1994
Filed:
Jul. 02, 1992
Applicant:
Inventors:
Masao Ishida, Okaya, JP;
Yoshio Naruse, Okaya, JP;
Assignee:
Teikoku Piston Ring Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
2772 / ; 277236 ; 277D / ;
Abstract
A piston ring is made of a titanium alloy, at least an outer peripheral surface and upper and lower surfaces thereof are formed with a nitrogen diffused layer, and at least an outer peripheral sliding surface thereof is coated with a hard film by physical vapor deposition on the nitrogen diffused layer.