Ferrofluid composition and method of making and using same
US4430239A · kind A · utility
61Cited by
9References
29Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1983 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | Feb 7, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stable liquid composition which comprises a colloidal dispersion of finely-divided, magnetic particles in a liquid polar carrier and a dispersing amount of a surfactant, which surfactant comprises a phosphoric acid ester of a long-chain alcohol, the alcohol compatible with the polar carrier, to provide a stable ferrofluid composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.