Deposit and collection receptacles – Closures and chutes – Gravity reverse checks
Patent
1996-04-26
1998-10-27
Bonner, Melissa
Deposit and collection receptacles
Closures and chutes
Gravity reverse checks
252 6253, 252 6254, H01F 144
Patent
active
058274448
ABSTRACT:
The present invention provides a magnetic fluid which comprises a magnetic fluid comprising magnetic fine particles coated with a fatty acid in an oily medium, and at least one selected from the group consisting of sulfonate surfactants and animal waxes, has an excellent stability even when used at a high temperature and high humidity and having the fluidity maintained for a long period, and is suitable for use particularly in a severe environment as a bearing, magnetic damper, magnetic seal, specific gravity separator, liquid damper, switch, acceleration sensor, tilt sensor, or heat exchanger for heat pipe or heat sink, and further a magnetic fluid-stabilizing additive allowing the magnetic fluid to have an excellent stability for a long period while maintaining the magnetic fluid's own performance even when used at a high temperature and high humidity for a long period, and a method of stabilizing the magnetic fluid.
REFERENCES:
patent: 4025448 (1977-05-01), Sudol
patent: 4701276 (1987-10-01), Wyman
patent: 4976883 (1990-12-01), Kanno et al.
patent: 5143637 (1992-09-01), Yokouchi et al.
Matsumura Yusuke
Okura Kousuke
Shimizu Kazuya
Bonner Melissa
Taiho Industries Co. Ltd.
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