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. 26, 2019
Filed:
Oct. 16, 2015
Applicants:
Mahle Metal Leve S/a, Jundiaí, BR;
Mahle International Gmbh, Stuttgart, DE;
Inventor:
Gisela Ablas Marques, Jundiaí, BR;
Assignees:
Mahle Metal Leve S/A, , BR;
Mahle International GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 9/26 (2006.01); C23C 28/04 (2006.01); C23C 8/26 (2006.01); C23C 8/80 (2006.01); C23C 14/06 (2006.01); C23C 28/00 (2006.01);
U.S. Cl.
CPC ...
C23C 28/044 (2013.01); C23C 8/26 (2013.01); C23C 8/80 (2013.01); C23C 14/0641 (2013.01); F16J 9/26 (2013.01); C23C 28/00 (2013.01);
Abstract
A piston ring may include a stainless steel base having between 8% and 15% by weight of chromium, together with other elements and impurities, and having a hardness between 350 HV and 420 HV. The piston ring may also include a superficial nitrided layer having a depth of no more than 60 μm and an average hardness measured upon the surface exceeding 800 HV. The nitrided layer may include a plurality of nitride particles, which may have a maximum size of 5 μm and may be distributed over between 4% and 8% of an area of the nitrided layer.