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US 6,033,835 AGranted
Developing/fixing monobath and its use for processing low silver black-and-white photographic elements
AssigneeEastman Kodak Company
InventorsAlan S. Fitterman, Robert E. Dickerson
Life of this patent
Estimating the term…
Abstract
Low silver black-and-white photographic silver halide elements, such as radiographic films, can be processed quickly using a developing/fixing monobath composition that includes an ascorbic acid developing agent, sulfite ions and a photographic fixing agent that has both a thiol group and an amino group (such as cysteine).
Claims17
An aqueous black-and-white developing/fixing monobath composition that has a pH of from about 10 to about 12.5 and is free of dihydroxybenzene developing agents and ammonium ions, and comprises:
- from about 80 to about 200 mmol/l of an ascorbic acid developing agent,
- at least 200 mmol/l of sulfite ions, and
- from about 40 to about 300 mmol/l of an organic compound having both a thiol group and an amino group, as the sole photographic fixing agent.
Dependencies are inferred from the claim text.