Title: Fogged, direct positive silver halide emulsions containing a bleach inhibiting compound and a Dmin maintainer compound

Abstract: Direct positive silver halide materials based on the Herschel effect having substantially reduced sensitivity to room light exposure contain a heterocyclic compound to prevent white light bleaching along with a second heterocyclic compound to prevent latent image formation due to white light exposure.

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Inventors: Fischer, Leewellyn C. (Fairport, NY, US)
Hunt, Heman Dowd (Webster, NY, US)

Application Number: 403263
Filing Date: 1973-09-28
Publication_date: 1976-01-20
Assignee: E. I. Du Pont de Nemours and company (Wilmington, DE)
Primary Class(es): 430/411 430/596, 430/597, 430/606, 430/611, 430/613, 430/614
Other Classes:
US Patent Ref:

3050395	Aug, 1962	Duffin	96/101.
3062651	Nov, 1962	Hillson	96/101.
3526507	Sep, 1970	Ishikawa et al.	96/101.
3679424	Jul, 1972	Barbier et al.	96/109.
3782957	Jan, 1974	Ohkubo et al.	96/101.

Other Refs:
Primary Examiner: Louie, Jr., Won H.
Assistant Examiner:
Attorney: