Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Patent
1974-08-02
1977-01-18
Klein, David
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
96 3, 96 68, 96 73, 96 74, 96 77, G03C 554, G03C 176, G03C 700, G03C 140
Patent
active
040037444
ABSTRACT:
The present invention relates to photography and, more particularly, to diffusion transfer process photographic film units which comprise a photosensitive element adapted to provide, by diffusion transfer photographic processing, selective dye image recordation of incident actinic radiation as a function of the point-to-point degree of photosensitive element exposure, which film unit includes a plurality of photosensitive units each exhibiting a predetermined gamma of substantially the same value and within a range of 1.1 to 1.7 and at least one of the units includes, in contiguous relationship, a first silver halide photosensitive layer comprising a particulate dispersion of photosensitive silver halide crystals, preferably silver iodobromide, iodochloride and/or iodochlorobromide crystals, possessing a first gamma and a second silver halide photosensitive layer possessing a second gamma having disposed therein dye developer which is diffusible during processing as a function of the point-to-point degree of silver halide layer exposure to incident actinic radiation. The value of the first said gamma differs from that of said second gamma by at least about 0.25, said gammas, taken together, are within the range of about 1.7 to 3.0 and each is greater than the predetermined gamma, said first silver halide layer exhibits sensitivity to incident radiation actinic to the layer in excess of the sensitivity exhibited to said radiation by said second silver halide layer; and the photographic speed differential between said first and said second layer is within the range of about 1 to 7 stops, and a layer adapted to receive dye diffusing thereto; and to specified diffusion transfer processes employing such film units.
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Klein David
Mervis Stanley H.
Polaroid Corporation
Schilling Richard L.
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