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. 27, 1998
Filed:
Oct. 02, 1996
Applicant:
Inventor:
Walter Helgeland, Quechee, VT (US);
Assignee:
Rigaku/USA, Inc., Danvers, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277302 ; 277410 ;
Abstract
A magnetic fluid sealing device adapted to enable rotary motion to be coupled by a shaft between an ambient high pressure environment to a high temperature, low pressure environment. Gaps in the shaft are dynamically sealed by a magnetic seal which uses a thin walled pole piece, a high power magnet and magnetic fluid. The pole piece and an extension thereof form a vacuum envelope for the remainder of the device, eliminating the need for the usual O-ring static seals.