Gas separation: apparatus – Electric field separation apparatus – With nonelectrical gas treating or conditioning means
Patent
1974-06-10
1976-01-20
Brown, J. Travis
Gas separation: apparatus
Electric field separation apparatus
With nonelectrical gas treating or conditioning means
96100, 96 566, G03C 176
Patent
active
039335011
ABSTRACT:
Color photographic elements containing silver halide and incorporated color-forming materials are described. These elements contain at least two differentially light-sensitive emulsion layers, the overlying layer being sensitive to the relatively shorter wavelengths and containing at least one yellow dye-forming color coupler which has the unusual ability to inhibit the reaction of competing couplers (such as citrazinic acid, for example) when competing couplers are used in color developing solutions in the conventional manner. Use of these couplers in the overlying (color) layer of multi-layer color photographic elements makes it possible to produce colored images having improved graininess.
Couplers having this unusual capability are selected from those having the structures: ##SPC1##
Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined herein.
REFERENCES:
patent: 3265506 (1966-08-01), Weissberger et al.
patent: 3408194 (1968-10-01), Loria
patent: 3647452 (1972-03-01), Hendess et al.
patent: 3770446 (1973-11-01), Sato et al.
patent: 3816121 (1974-06-01), Shiba et al.
Cameron Robert G.
Neuberger Dan
Brown J. Travis
Eastman Kodak Company
Lewis J. T.
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