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:
Oct. 08, 2019
Filed:
Apr. 17, 2016
Mahle Metal Leve S/a, Jundiai, BR;
Mahle International Gmbh, Stuttgart, DE;
Juliano Avelar Araujo, Jundiai, BR;
Paulo Jose Da Rocha Mordente, Jundiai, BR;
Robert R. Banfield, Sao Paulo, BR;
Mahle Metal Leve S/A, , BR;
Mahle International GmbH, , DE;
Abstract
A piston ring for an internal combustion engine may include a substantially annular base of a ferrous alloy upon which is applied a coating. The coating may have a first bonding layer and at least a first external layer or a second external layer deposited upon the first bonding layer up to a maximum of 100 micrometers in thickness of a plurality of sequentially deposited first and second external layers. The first external layer may include a nitride of a doped metal chemical element, a doping element being aluminum. The second external layer may include a nitride of the metal chemical element. The first external layer may have a thickness greater than at least once a thickness of the second external layer and less than ten times the thickness of the second external layer.