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:
Apr. 29, 1980
Filed:
Nov. 29, 1978
Applicant:
Inventors:
Philip Stahl, Holliston, MA (US);
Ronald Moskowitz, Merrimack, NH (US);
Walter R Reed, Merrimack, NH (US);
Assignee:
Ferrofluidics Corporation, Burlington, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; F16J / ;
U.S. Cl.
CPC ...
277 80 ; 277 13 ; 277135 ;
Abstract
A ferrofluid centrifugal seal and method of sealing a rotatable shaft, wherein ferrofluid is retained in an O-ring-seal form at static and low speeds and is moved to a barrier seal in a passageway at high speeds.