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:
Jun. 01, 1993
Filed:
Oct. 21, 1991
Applicant:
Inventors:
Atsushi Yokouchi, Yokohama, JP;
Shigeki Matsunaga, Tokyo, JP;
Assignee:
NSK, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; F16J / ;
U.S. Cl.
CPC ...
277 80 ; 277 961 ; 277133 ;
Abstract
A magnetic fluid sealing device is provided for sealing a gap between a first member and a second member movable relative to each other. The device has a magnetic fluid and a magnet for retaining the magnetic fluid in the gap. A two-dimensionally bonded monomolecular layer is formed as an oil-repelling layer from a coupling agent on at least an intermediate surface area of at least one of the first and second members, which intermediate surface area is located between a fluid-deposited surface area and a fluid-free surface area.