Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask
Patent
1979-10-01
1982-01-05
Brammer, Jack P.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Radiation mask
430 13, 430198, 430203, 430523, G03C 700
Patent
active
043094953
ABSTRACT:
Glass photomasks having a stained pattern within the glass for use in photolithographic processes are made by exposing and developing a photographic emulsion on a sheet of glass and migrating silver ions from the emulsion into the surface of the glass under the influence of an electric field and moderately elevated temperatures.
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Brammer Jack P.
Millman Dennis G.
PPG Industries Inc.
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