Magnetic recording medium
US4239835A · kind A · utility
27Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium wherein a ferromagnetic substance consisting of Fe, Co, Ni or alloy thereof is vacuum evaporated and deposited on a substrate made of a plastic film or a sheet of non-magnetic metal. The thin ferromagnetic film has the columnar crystal structure, and the columnar crystals are coated with a layer of oxide of the ferromagnetic substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.