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. 24, 1981
Filed:
May. 01, 1980
Applicant:
Inventors:
Kuldip Raj, Merrimack, NH (US);
Ronald Moskowitz, Merrimack, NH (US);
Raoul Casciari, Bedford, NH (US);
Alvan F Chorney, Stoughton, MA (US);
Assignee:
Ferrofluidics Corporation, Nashua, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; F16J / ;
U.S. Cl.
CPC ...
277-1 ; 277 343 ; 277 80 ; 277226 ; 206303 ; 156 86 ; 156122 ;
Abstract
A self-activating ferrofluid-seal apparatus for a memory-disc-drive shaft, which seal apparatus comprises a ring magnet and a pair of pole pieces which form a cavity therebetween, a closed loop of a plastic tubular container with ferrofluid positioned within the cavity, and a penetration clamp to penetrate the plastic container prior to installation of the shaft element.