Method for the manufacture of a metallic recording substrate for a capacitance electronic disc and the recording substrate obtained thereby
US4402798A · kind A · utility
7Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1982 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Feb 16, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12847
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In accordance with the present disclosure recorded metallic recording substrates made of a relatively soft metal are coated with a conformal 200 to 400 angstroms thick layer of chromium, chromium oxide, or a mixture thereof, and then preferably passivated prior to being used as matrixes in the replication process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.