Magnetic recording medium
US4840844A · kind A · utility
34Cited by
5References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 2, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Jun 2, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium which comprises a non-magnetic substrate, a magnetic film formed on the substrate and a protective film provided on the magnetic film, the protective film being composed of at least two groups of element, the element in one group being at least one of B and C having a smaller atomic size, and a concentration of the element increasing from the interface side of the protective film with the magnetic film toward the opposite face side throughout the protective film has an improved durability against a magnetic head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.