Process for producing cobalt containing ferromagnetic iron oxides
US4414245A · kind A · utility
9Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1982 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Jul 23, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/70673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process which comprises coating a cobalt compound or a combination of a cobalt compound and a ferrous compound on the surface of magnetic iron oxide particles and then heating the coated particles in the presence of water vapor. The cobalt containing ferromagnetic iron oxide produced by this process is excellent in coercivity and thermal stability. Further, magnetic tape produced from this iron oxide has a high coercivity and is excellent in squareness, orientability and remanent induction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.