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:
Dec. 25, 1990
Filed:
Nov. 21, 1989
Applicant:
Inventor:
Hatsutaro Mizuno, Kashiwazaki, JP;
Assignee:
Kabushiki Kaisha Riken, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277216 ; 277223 ; 277236 ; 277D / ;
Abstract
A compound steel oil ring assembly has nitrided side rails and a spacer expander. The opposing end portions of each side rail are treated to prevent formation of a nitride layer solely at these portions in order to reduce their hardness. This reduces the degree to which the corner portions of the opposing ends wear away the side surfaces of a piston oil ring groove.
Mizuno, Hatsutaro. (1990). Oil ring assembly (U.S. Patent No. 4979757). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4979757
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile