Capacitance electronic disc stamper having improved stain resist

Details Capacitance electronic disc stamper having improved stain resist Capacitance electronic disc stamper having improved stain resist

1982-05-28

1983-09-20

Lesmes, George F.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

3461351, 346137, 369276, 428469, B32B 300, C23C 1500

Patent

active

044056702

ABSTRACT:
Nickel stampers used for the molding of capacitive electronic discs are treated prior to use in the molding process by heating the stamper in the presence of an oxygen containing gas, at a temperature from about 220.degree. C. to about 300.degree. C. for 2 to 5 hours until a continuous protective oxide layer approximately 10-40 angstroms thick is formed on the surface of the stamper.

REFERENCES:
patent: 3909517 (1975-09-01), Clemens
patent: 4004080 (1977-01-01), Vossen, Jr. et al.
patent: 4057831 (1977-11-01), Jacobs et al.
patent: 4077051 (1978-02-01), Vossen, Jr.
patent: 4189331 (1980-02-01), Roy
"Tarnishing of Nickel in Air at Temperatures from 23.degree. to 200.degree. C. and Relative Humidities from Ambient to 95%" by S. H. Kulpa and R. P. Frankenthal, Electrochemical Society Solid-State Science and Technology, Oct. 1977.

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