Abrasion resistant magnetic recording member
US4804590A · kind A · utility
29Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Nov 25, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An abrasion resistant magnetic recording member having a carbonaceous surfacial protective film for protecting a surface of a magnetic film formed on a substrate, and the carbonaceous surfacial protective film is formed of a lower layer comprising a comparatively hard carbonaceous film and an upper layer comprising a comparatively soft carbonaceous film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.