Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1985-03-20
1986-08-05
Barr, Josephine L.
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252503, 252506, 252511, 252516, 252 6251, 252 6252, 252 6255, 252 6256, 252 6253, 252 6254, H01B 106
Patent
active
046042296
ABSTRACT:
An electrically conductive ferrofluid composition and a method of preparing and using the ferrofluid composition in a ferrofluid seal apparatus, and which ferrofluid composition comprises a liquid carrier having a colloidal dispersion of ferromagnetic particles in an amount sufficient to provide magnetic properties to the ferrofluid composition and carbon particles in an amount sufficient to provide electrical conductive properties to the ferrofluid composition, the ferromagnetic and carbon particles stabilized in the ferrofluid composition by a surface active dispersing agent. The electrically conductive ferrofluid composition is usefully employed in a ferrofluid exclusion seal apparatus to provide an electrically conductive seal apparatus particularly useful for computer disk drives and sputtering apparatus in the semiconductive industry.
REFERENCES:
patent: 3764540 (1973-10-01), Khalafalla et al.
patent: 4430239 (1984-02-01), Wyman
patent: 4469624 (1984-09-01), Ueda et al.
Borduz Lucian
Gowda Hanumaiah L.
Raj Kuldip
Barr Josephine L.
Crowley Richard P.
Ferrofluidics Corporation
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