US 5,004,812 AGranted

Direct positive dimethine cyanine dyes containing 1-aryl-2-heteroaryl indole nucleus

AssigneeE. I. Du Pont de Nemours and Company

InventorThomas D. Weaver

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Abstract

Compounds as defined having a 1-phenylindole nucleus substituted in the 2-position with a 3-pyridyl group. Such compounds are useful in the preparation of cyanine dyes which can be used to sensitize silver halide emulsions for fogged direct-positive films.

Claims2

Dependent claims

3-formyl-1-phenyl-2(3-pyridyl)-1H-indole having the formula:

##STR14##

Dependencies are inferred from the claim text.

Facts

Application: 07/479,484Filed 22 Jan 1990 · division
Priority: 26 Jun 1987
Granted: 2 Apr 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

C09B 23/105
The polymethine chain containing an even number of >CH- groups: two >CH- groups
G03C 1/4853
Characterised by the desensitiser: polymethine dyes
C09B
Organic dyes or closely-related compounds for producing dyes
G03C
Photosensitive materials for photographic purposes

Family

Serial66,552Parent of this division · filed 26 Jun 1987
Serial304,574Parent of this division · filed 31 Jan 1989
US 4,927,933 AParent of this division
US 4,839,271 AParent of this division
US 5,004,812 AThis patent

From the US filing history. Foreign family members aren’t listed.

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