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US 4,396,711 AGranted
Speed-increasing adjuvants for silver halide emulsions
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph D. Overman
Life of this patent
Estimating the term…
Abstract
Derivatives of thiazolidine are used in photographic silver halide emulsions to increase their speed 40% or more with little or no increase in emulsion fog. Lower silver halide coating weights are thus possible.
Claims14
A photographic film comprising
- (1) a support, and
- (2) a radiation-sensitive, colloid-silver halide emulsion layer containing a sensitizing amount of a compound selected from the group consisting of ##STR13## wherein R is an alkyl of 1-4 carbon atoms;
- ##STR14## wherein R' is a member of the group consisting of ##STR15## and the hydrochloride salts thereof.
Dependencies are inferred from the claim text.