Particulate compositions of ferromagnetic metal oxalates in the form of submicronic acicular particles, the preparation of same and application thereof
US4803291A · kind A · utility
8Cited by
7References
19Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 2, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Jul 2, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosed particulate composition of simple or mixed oxalate of ferromagnetic metals is characterized in that it is provided in the form of needle-shaped particles having a length comprised between 0.05 and 0.5 micrometer, with a proportion higher than 60% of particles having a length equal to the average length .+-.0.1 .mu.m. and an acicular ratio higher than 3, said average length being comprised between 0.15 and 0.35 .mu.m; its preparation and its application are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.