Metal treatment – Compositions – Heat treating
Patent
1978-09-05
1980-02-12
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
204 5, 264107, C23F 702, B29D 1700
Patent
active
041882407
ABSTRACT:
The metallic surface of a master plate or mother plate is oxidized in a solution of hypochlorite to form a parting layer upon which a metal layer is plated. The metal layer may be stripped from the master plate or mother plate aided by the parting layer to form a matrix or stamper from which a plastic record disc, such as, a video disc, can be molded.
REFERENCES:
patent: 2530842 (1950-11-01), Ruggieri
Eslinger Lewis H.
Kendall Ralph S.
Sinderbrand Alvin
Sony Corporation
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