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:
Sep. 17, 2002
Filed:
Nov. 28, 2000
Applicant:
Inventors:
Vardarajan R. Iyengar, Beavercreek, OH (US);
Robert T. Foister, Rochester Hills, MI (US);
Assignee:
Delphi Technologies, Inc., Troy, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/44 ;
U.S. Cl.
CPC ...
H01F 1/44 ;
Abstract
A magnetorheological fluid formulation exhibiting high yield stress at high surfactant concentrations. The formulation has a strong network formation due to incorporation of a high surface area untreated fumed silica as a thixotropic agent. This untreated fumed silica has a surface area of at least about 250 m /g, which enables a surfactant concentration in the formulation in an amount up to about 35% by weight relative to the weight of the fumed silica.