Method for making a metal master for producing a gramophone reco

Details Method for making a metal master for producing a gramophone reco Method for making a metal master for producing a gramophone reco

1977-05-02

1978-10-03

Hoag, W. E.

Chemistry: electrical and wave energy

Processes and products

156629, 264106, 264129, 264219, B29C 2400, B29C 2500

Patent

active

041182871

ABSTRACT:
There is described a method for making a metal master for producing a gramophone record provided with writing in the center thereof, particularly inside a pressure press, and according to which the engraving of the sound-grooves is obtained from a mold element which is prepared by galvanically plating metal on a non-conductive support which has been engraved previously, in which means are provided to prepare an etching on the center part of the non-conductive support, on which support is then performed the galvanic metal plating to form the one mold element for producing one record side.

REFERENCES:
patent: 3787274 (1974-01-01), Genma
patent: 3787275 (1974-01-01), Genma
patent: 3962495 (1976-06-01), Feldstein

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