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:
Oct. 16, 2018
Filed:
Sep. 01, 2014
Applicant:
Kabushiki Kaisha Riken, Tokyo, JP;
Inventors:
Keiji Honda, Niigata, JP;
Katsuhiro Tsuji, Niigata, JP;
Masaki Moronuki, Niigata, JP;
Takuma Sekiya, Niigata, JP;
Assignee:
KABUSHIKI KAISHA RIKEN, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 14/06 (2006.01); F16J 9/26 (2006.01); F16J 10/04 (2006.01); C23C 14/02 (2006.01); F02F 5/00 (2006.01);
U.S. Cl.
CPC ...
F16J 9/26 (2013.01); C23C 14/024 (2013.01); C23C 14/0605 (2013.01); C23C 14/0635 (2013.01); F16J 10/04 (2013.01); F02F 5/00 (2013.01);
Abstract
The present invention provides a piston ring having excellent abrasion resistance to an aluminum alloy cylinder or cylinder liner formed of a mating material and is therefore capable of decreasing abrasion of the mating material. An exemplary piston ring has a hard carbon coating formed on an outer peripheral surface, and the hard carbon coating contains 0.5 atom % or more to less than 5 atom % of tungsten (W).