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:
Feb. 22, 2011
Filed:
Jun. 16, 2007
Juliano Avelar Araujo, Sao Paulo, BR;
Gisela Ablas Marques, Sao Paulo, BR;
Jose Valentim Lima Sarabanda, Rugby, GB;
Robert Richard Banfield, Sao Paulo, BR;
Juliano Avelar Araujo, Sao Paulo, BR;
Gisela Ablas Marques, Sao Paulo, BR;
Jose Valentim Lima Sarabanda, Rugby, GB;
Robert Richard Banfield, Sao Paulo, BR;
Mahle International GmbH, Stuttgart, DE;
Mahle Metal Leve S.A., Sao Paolo, SP, BR;
Abstract
The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features: