Electrically conductive ferrofluid bearing and seal apparatus an

Details Electrically conductive ferrofluid bearing and seal apparatus an Electrically conductive ferrofluid bearing and seal apparatus an

1985-09-09

1987-06-16

Tupper, Robert S.

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Drum record

252 6252, 277 80, G11B 552, G11B 2104, E21B 3300, G01M 2782

Patent

active

046739971

ABSTRACT:
An electrically conductive ferrofluid-film-bearing apparatus and seal apparatus for a shaft which employs a low-viscosity, electrically conductive ferrofluid composition, which composition comprises a liquid carrier, and contains in combination an electrically conductive amount of a cationic surfactant and dispersed carbon particles, to obtain a low-electrical-resistivity ferrofluid having a low viscosity and suitable for use in a ferrofluid bearing apparatus.

REFERENCES:
patent: 3990981 (1976-11-01), Kovac et al.
patent: 4094804 (1978-07-01), Shimoiizaka
patent: 4315827 (1982-02-01), Bottenberg et al.
patent: 4363047 (1982-12-01), Maruyama et al.
patent: 4490759 (1984-12-01), Maruyama
patent: 4526484 (1985-07-01), Stahl et al.

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