Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements
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.
Description
Patent History
Patent number: T103803
Type: Grant
Filed: Aug 16, 1982
Date of Patent: Jan 3, 1984
Inventors: Roger Lok (Hilton, NY), John P. Freeman (Rochester, NY), William N. Baum (Henrietta, NY)
Application Number: 6/408,536
Type: Grant
Filed: Aug 16, 1982
Date of Patent: Jan 3, 1984
Inventors: Roger Lok (Hilton, NY), John P. Freeman (Rochester, NY), William N. Baum (Henrietta, NY)
Application Number: 6/408,536
Classifications
Current U.S. Class:
Bicyclo Ring System Having The Five-membered Hetero Ring As One Of The Cyclos (548/121);
Developing Inhibitor Or Processing Ingredient Containing (430/505);
And Antifoggant Or Color Stabilizer (430/551);
Heterocyclic N, O, S, Se, Or Te Compound Containing (430/600);
Polyhetero Atom Ring (430/614);
Nitrogen Attached Directly To The Thiazole Ring By Nonionic Bonding (548/161);
Chalcogen Attached Indirectly To The Bicyclo Ring System By Nonionic Bonding (548/179);
Polycyclo Ring System Having The Oxazole Ring As One Of The Cyclos (548/217);
Nitrogen Bonded Directly At The 2-position Of The Oxazole Ring (548/222);
548/329;
548/330
International Classification: C07D27782; C07D26358; C07D23530;
International Classification: C07D27782; C07D26358; C07D23530;
