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:
Feb. 22, 2005
Filed:
Oct. 18, 2002
Applicants:
Zhixin LI, Hudson, NH (US);
Andrew Schreiber, Ashby, MA (US);
Jurgen Zinsstag, Nashua, NH (US);
Inventors:
Assignee:
FerroTec (USA) Corporation, Nashua, NH (US);
Primary Examiner:
Int. Cl.
CPC ...
F16J015/43 ;
U.S. Cl.
CPC ...
Abstract
A ferrofluid seal incorporates a metal seal comprised of two knife-edges and a flat metal washer is formed between a pole piece and the housing at the axial interface between the parts. One knife edge is machined into the inner face of the housing flange and the other knife edge is machined into the opposing pole piece face. This metal seal effectively seals the pole piece to the housing with a seal suitable for ultra high vacuum applications.