Method of developing opaquely coated sensitized matrix with a so

Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...

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96 48R, 427 68, G03C 500

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active

039986381

ABSTRACT:
In the method of fabricating color television picture tubes, it is desirable to photo-expose and develop the exposed portions to define a phosphor matrix pattern. In such techniques an opaque coating may be deposited over the sensitized matrix coating which is to be developed. A periodate containing solution, to which is added a predetermined amount of sodium meta-silicate, is used as the developing solution to remove the sensitized matrix portions, while leaving behind the opaque light absorbing pattern on the screen substrate.

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patent: 3837885 (1974-09-01), Angelucci

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