Magnetic powder and magnetic recording medium comprising the same
US4874668A · kind A · utility
8Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1987 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Jul 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic powder at least a part of particles of which have surface-adjacent layers comprising an aluminium-containing oxide of the corundum structure has high hardness so that a magnetic recording medium comprising a magnetic layer containing such magnetic powder has improved durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.