Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Patent
1973-07-20
1976-01-06
Kelley, Mary F.
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
96 76R, 96 95, G03C 526, G03C 106
Patent
active
039308596
ABSTRACT:
An improved photographic processing system and process are provided. The system includes a novel photographic recording medium comprising a layer of silver halide emulsion, a barrier layer disposed on a surface thereof, the barrier layer being soluble in aqueous alkali but insoluble in water and acidic media, and an acidic developer disposed as a layer on the outer surface of the barrier layer or mixed therewith. The developer is activatable at an alkaline pH. A novel processing web comprising a support containing an alkali and a free water source is also provided, which web is adapted for contacting the layer containing developer to initiate development of the silver halide. The developer thus is isolated from alkali and from the emulsion prior to developing. The process includes exposure of the recording medium, followed by the described contacting for development of a visible image. Nucleating and complexing agents can be included in the web, to remain with the web, to provide a positive print by diffusion transfer and/or to aid in stabilization of the photographic emulsion.
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Bell & Howell Company
Kelley Mary F.
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