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US 4,873,180 AGranted
Developer compositions for silver halide photographic materials comprising cyclic amino methane diphosphonic acid compounds
AssigneeMinnesota Mining and Manufacturing Company
InventorsCarlo Marchesano, Franco Buriano, Enrico Furlanetto
Life of this patent
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Abstract
The addition to an aqueous alkaline developer composition for silver halide photographic materials of a dialkylaminomethane diphosphonic acid compound sequestering agent increases the resistance of the developer composition against aerial oxidation and inhibits calcareous deposit formation.
Claims13
An alkaline aqueous developer composition for silver halide photographic materials which comprises a silver halide developing agent and a cyclicaminomethane diphosphonic acid compound sequestering agent.
Dependencies are inferred from the claim text.