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:
Nov. 16, 2010
Filed:
Jun. 16, 2007
Applicants:
Juliano Avelar Araujo, Sao Paulo, BR;
Gisela Ablas Marques, Sao Paulo, BR;
Jose Valentim Lima Sarabanda, Rugby, GB;
Inventors:
Juliano Avelar Araujo, Sao Paulo, BR;
Gisela Ablas Marques, Sao Paulo, BR;
Jose Valentim Lima Sarabanda, Rugby, GB;
Assignees:
MAHLE International GmbH, Stuttgart, DE;
MAHLE Metal Leve, S.A., Sao Paulo, BR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N.