Method for the manufacture of a metallic recording substrate for a capacitance electronic disc and the recording substrate obtained thereby
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United States of America Patent
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Sep 6, 1983
Grant Date -
N/A
app pub date -
Feb 16, 1982
filing date -
Feb 16, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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