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. 16, 1982
Filed:
Feb. 13, 1981
Applicant:
Inventors:
William R Bottenberg, Thousand Oaks, CA (US);
Mark S Chagnon, Lowell, MA (US);
Assignee:
Ferrofluidics Corporation, Nashua, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
252 6251 ; 252 6252 ;
Abstract
A stable ferrofluid composition which comprises a colloidal dispersion of finely-divided magnetic particles in a liquid, low-pressure, polyphenyl ether carrier and a dispersing amount of a surfactant, which surfactant comprises a polyphenyl ether surfactant containing a functional group, such as an acidic group, and an aromatic tail group which is soluble in the polyphenyl ether carrier, to provide a stable ferrofluid composition.