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US 5,491,048 AGranted
Removal of tin from seasoned photographic color developers
AssigneeEastman Kodak Company
InventorsErnest R. Anderson, Stephen N. Lowery
Life of this patent
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Abstract
A process for removing tin from seasoned photographic color developers containing tin as stannous or stannate complex ions, comprising the steps of: (a) collecting seasoned photographic color developer containing tin; (b) treating the collected developer with a resin having a chelating group selected from the group consisting of diphosphonic acid, amidoxime and thiol, thereby removing tin from the composition.
Claims8
A process for removing tin from seasoned photographic color developers containing tin as stannous or stannate complex ions, comprising the steps of:
- (a) collecting seasoned photographic color developer containing tin;
- (b) treating the collected developer with a resin having a chelating group selected from the group consisting of diphosphonic acid, amidoxime and thiol, thereby removing tin from the seasoned photographic color developers.
Dependencies are inferred from the claim text.