Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
Granted 3 Jan 1984 · no office action yet
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Inventors: Roger Lok, William N. Baum, John P. Freeman · Examiner: · AU 122 · TC 1200
Life of the patent
2 dated eventsAbstract
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## and R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.
Classifications
16 codes- C07D277/82
- C07D293/12
- C07D263/58
- G03C1/10
- G03C1/34
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