Process for producing cobalt-containing magnetic iron oxide powder
US4594267A · kind A · utility
4Cited by
2References
4Claims
0Family size
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Key dates
| Filing date | Mar 25, 1985 |
| Grant date | Jun 10, 1986 |
| Priority date | — |
| Expiry date | Mar 25, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/70673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cobalt-containing magnetic iron oxide powder is provided by first coating a magnetic iron oxide base powder with a ferrous compound and then coating it with a cobalt compound. The cobalt-containing magnetic iron oxide powder provided is improved in stability of coercivity under aging and various other magnetic properties, and the magnetic tape produced by using the powder is also appreciably improved in stability of coercivity under aging as well as in various magnetic properties such as squareness, orientability and switching field distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.