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:
Mar. 20, 2018
Filed:
Oct. 16, 2014
Kabushiki Kaisha Riken, Chiyoda-ku, Tokyo, JP;
KABUSHIKI KAISHA RIKEN, Chiyoda-ku, Tokyo, JP;
Abstract
Provided is a piston ring for an internal combustion engine capable of preventing aluminum cohesion for a long time under conditions with high temperature and a high load and also suppressing the wearing of a piston member. A piston ringfor the internal combustion engine including a piston ring bodyhaving at least one of an upper side face and a lower side face coated with an aluminum cohesion resistance film, wherein the aluminum cohesion resistance filmhas a first coating filmmade of first ceramics material formed on the piston ring body and a second coating film having Vickers hardness HV smaller than that of the first ceramics material formed on the first coating film