Method of making coloured photomasks

Details Method of making coloured photomasks Method of making coloured photomasks

1974-06-25

1976-01-20

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

65 30, 65 60, 117124C, 204130, 204181, B01K 500, C03C 1700

Patent

active

039336093

ABSTRACT:
The method of making coloured photomasks used in manufacture of printed-circuit boards and microcircuits, consisting in doping the surface of a glass substrate with a staining metal by virtue of a repeated electrodiffusion of the ions of the staining metal occurring from diverse melts, followed by reduction of the staining metal. Further on, a protective layer is applied to the glass substrate stained layer, corresponding to a predetermined pattern, the unprotected portions of the stained layer are removed and the protective layer is eliminated.

REFERENCES:
patent: 3622295 (1971-11-01), Loukes et al.

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