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. 16, 2019
Filed:
Dec. 22, 2015
Applicant:
Kabushiki Kaisha Riken, Tokyo, JP;
Inventors:
Takayuki Ichikawa, Kashiwazaki, JP;
Takuma Sekiya, Kashiwazaki, JP;
Assignee:
KABUSHIKI KAISHA RIKEN, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 8/02 (2006.01); F16J 9/26 (2006.01); C23C 8/26 (2006.01); C25D 5/50 (2006.01); C25D 7/00 (2006.01); F02F 5/00 (2006.01); F16J 9/06 (2006.01); C25D 5/36 (2006.01); C23C 28/00 (2006.01); C25D 7/06 (2006.01);
U.S. Cl.
CPC ...
F16J 9/26 (2013.01); C23C 8/02 (2013.01); C23C 8/26 (2013.01); C23C 28/32 (2013.01); C23C 28/34 (2013.01); C25D 5/36 (2013.01); C25D 5/50 (2013.01); C25D 7/00 (2013.01); F02F 5/00 (2013.01); F16J 9/06 (2013.01); F16J 9/065 (2013.01); C25D 7/0685 (2013.01);
Abstract
A combined oil control ring comprising a pair of annular side rails each having a gap, and an axially corrugated spacer expander arranged between the side rails; the corrugated spacer expander having on the inside seating tabs for pushing inner peripheral surfaces of the side rails; the side-rail-pushing surface of each seating tab being provided with a nitrided layer; an entire surface of each spacer expander except for those provided with the nitrided layer being coated with a plating film; and the plating film having Vickers hardness HV0.01 of 300 or less.