Magnetic recording medium
US4587178A · kind A · utility
5Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | May 6, 1986 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a support, a first layer formed on the support by evaporating cobalt or its alloy by an oblique-incidence vacuum evaporation technique, and a second plated layer made of cobalt or its alloy and formed by a wet plating. The cobalt alloy for the first layer substantially consists of, aside from cobalt, up to 30 wt % of Ni, Fe, Cu, W, Cr, Ru or a mixture thereof. On the other hand, the cobalt alloy for the second layer substantially consists of up to 40 wt % of Ni, up to 8 wt % of P and the balance of Co.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.