Method of making copies of information tracks on carriers

Details Method of making copies of information tracks on carriers Method of making copies of information tracks on carriers

1977-03-03

1978-11-14

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 27E, 96 48PD, G03C 524, G03C 158

Patent

active

041254015

ABSTRACT:
Copying by photographic means of plates having coded audio and video information of a very fine structure. Use is made of an aromatic diazosulphide as light-sensitive system, wherein, after exposure, a metal nuclei image is produced by contact with metal salt, which metal nuclei image is at or below the surface and which is intensified by means of physical development to an externally reflective and, as such, readable image.

REFERENCES:
patent: 3381085 (1968-04-01), Johnson et al.
patent: 3687664 (1972-08-01), Broadbent
patent: 3925080 (1975-12-01), Postma
Jerome, et al., Journal of the SMPTE, vol. 83, #7, 7/1974, paper presented 4/1974, pp. 560-563.

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