Composition and method of making a ferrofluid having an improved chemical stability
US6261471A · kind A · utility
15Cited by
9References
37Claims
0Family size
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a composition and a process for producing a magnetic fluid comprising finely divided magnetic particles covered with at least one surfactant. A fluorocarbon-silane surface modifier is employed which is added to cover the free oxidizable exterior surface of the outer layer of the particles to increase the acid resistance of the colloid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.