Release of photographic reagents with oxidized...

G - Physics – 03 – C

Patent

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96/282, 96/34

G03C 5/30 (2006.01) G03C 7/305 (2006.01)

Patent

CA 1160881

ABSTRACT OF THE DISCLOSURE Photographic reagents can be released from cer- tain photographic reagent releasing compounds by causing them to be oxidized by oxidized 3-pyrazolidone developing agents. Particularly useful photographic reagent releasing compounds are a-substituted ketones or imines in which a photographic reagent is joined to the a-carbon atom through a hetero atom which is cleaved from the a-carbon atom, under alkaline conditions, by means of oxidized 3-pyrazolidone developing agent. Photo- graphic assemblages containing photographic reagent releasing compounds and processes of releasing photo- graphic reagents in photographic elements and assemblages are described.

386830

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