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US 3,938,998 AGranted
Low contrast, rapid access, air stable, regenerable iron chelate developer solutions
AssigneeMinnesota Mining and Manufacturing Company
InventorsRichard S. Fisch, Norman Newman
Life of this patent
Estimating the term…
Abstract
Low contrast, rapid access, air stable, regenerable iron chelate developer solutions comprising at least two developer materials, at least one selected from each group comprising: 1. iron chelate developers and 2. amidol, gallic acid, tannic acid, and 2,5,di-tert-butyl hydroquinone.
Claims3
A rapid access, low contrast air stable non-fixing developer solution which comprises an iron chelate photographic developer and at least one second developer selected from the group consisting of amidol, gallic acid, tannic acid and 2,5, di-tert-butyl hydroquinone.
Dependencies are inferred from the claim text.