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:
Mar. 13, 2007
Filed:
Jul. 07, 2003
Applicant:
Zhixin LI, Hudson, NH (US);
Inventor:
Zhixin Li, Hudson, NH (US);
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
F16J 15/43 (2006.01);
U.S. Cl.
CPC ...
Abstract
A magnetic assembly for a multistage magnetic fluid rotary seal has a shaft, an annular permanent magnet, at least one pole piece and a radial gap formed between the shaft and the pole piece. The shaft and the pole piece have a plurality of trapezoidal-shaped ridges in opposing, non-contacting relationship forming the radial gap. The trapezoidal-shaped ridges have a flat top portion facing the radial gap and tapered sides that diverge away from the top portion.