Spinel-type spherical, black iron oxide particles and process for the producing the same
US5336421A · kind A · utility
51Cited by
3References
3Claims
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Key dates
| Filing date | Aug 10, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Aug 10, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed herein are spinel-type spherical black iron oxide particles containing 1.5 to 17.0 wt % of Zn, and having a specific surface area of 5 to 15 m.sup.2 /g, a magnetization of not less than 70 emu/g in an external magnetic field of 1 kOe and a coercive force (Hc) of not more than the value obtained from the following expression: EQU Hc(Oe)=15+3.times.(specific surface area of the particles). and a process for producing the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.