Process for producing cobalt-containing magnetic iron oxide powder
US4486467A · kind A · utility
1Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Dec 14, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/70684
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A phosphorus-containing magnetic iron oxide powder is subjected to the activation with an aqueous alkaline medium under pressure and then coated with a cobalt compound or a cobalt compound and other metallic compound(s) to produce a cobalt-containing magnetic iron oxide powder. The magnetic iron oxide powder obtained according to this process finds its best application to the production of magnetic recording media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.