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:
Jul. 13, 2021
Filed:
Jul. 13, 2018
Applicant:
Federal-mogul Burscheid Gmbh, Burscheid, DE;
Inventors:
Assignee:
FEDERAL-MOGUL BURSCHEID GMBH, Burscheid, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 9/26 (2006.01); B23P 15/06 (2006.01);
U.S. Cl.
CPC ...
F16J 9/26 (2013.01); B23P 15/06 (2013.01);
Abstract
A piston ring is produced from a main body made of steel or cast steel and comprising a running face, an inner circumferential surface, upper and lower flank regions, and transition regions from the running face to the respective flank region, by coating the running face and the transition regions with a first chromium layer, removing this first chromium layer at the running face down to the base material of the main body, providing at least the running face of the layer-free main body with a nitride layer, and, finally, coating the running face and the transition regions with at least one further chromium layer.