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US 5,849,470 AGranted
Mixed grain emulsions of the same grains having different speed properties for photographic elements
AssigneeEastman Kodak Company
InventorsJerzy Z. Mydlarz, Frederick C. Derks, Roger L. Klaus
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Abstract
The invention relates to a photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound.
Claims8
A photographic element comprising at least two negative working photographic emulsions wherein said at least two emulsions are the same emulsion and wherein at least one of said at least two same emulsions is treated with a speed decreasing compound wherein said speed decreasing compound is the compound
- R.sup.1 --X.sup.1 --X.sup.2 --R.sup.2 (Formula I)
- wherein
- X.sup.1 and X.sup.2 are independently S, Se, or Te, and
- R.sup.1 and R.sub.2 together form a ring system or are independently substituted or unsubstituted cyclic, acyclic, or heterocyclic groups and wherein said element comprises negative film and after treating at least one of said same emulsions has a different sensitivity.
1 more element
Dependencies are inferred from the claim text.