Process for preparing iron compound particles for use in magnetic recording
US4342589A · kind A · utility
4Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1981 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Jan 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a process for preparing fine needle-like, ferromagnetic iron compound particles for use in magnetic recording in which needle-like iron oxyhydroxide fine particles prepared by simultaneously co-precipitating or cladding iron compound particles with an element of group II of the Periodic Table and manganese at atomic weight ratios of the element of group II of the Periodic Table and manganese to iron of from 0.001/100 to 10/100 and 0.005/100 to 10/100 respectively are reduced and/or oxidized under heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.