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:
Aug. 12, 1986
Filed:
Sep. 13, 1983
Applicant:
Inventor:
Kimio Sato, Tokyo, JP;
Assignee:
Rigaku Keisoku Kabushiki Kaisha, Musashi-Murayama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277 80 ; 277135 ;
Abstract
A magnetic fluid sealing device has a housing, a shaft accommodated in the housing, a plurality of permanent magnets disposed, in series, coaxially with each other, and polepieces disposed between the two adjoining magnets. The polepieces have one or more concave grooves to form a plurality of knife edges for concentrating magnetic flux. The density of magnetic flux passing through the edge or edges located adjacent to a vacuum environment is more increased than that through other edges.