Mixed batchwise and continuous process for the production of cobalt modified magnetic iron oxide powder for use in high density recording
US5039553A · kind A · utility
1Cited by
11References
7Claims
0Family size
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Key dates
| Filing date | Apr 3, 1990 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Apr 3, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/712
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for the continuous production of cobalt-modified magnetic iron oxide. This process comprises carrying out a batchwise preliminary cobalt treatment by adding a magnetic iron oxide powder to an alkaline solution followed by the addition of a cobalt salt to cover the magnetic iron oxide powder with cobalt. A cobalt modification reaction is carried out continuously by passing the solution containing the preliminary cobalt-treated magnetic iron oxide powder under heat and pressure through a flow-type reaction vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.