Silver halide photographic elements spectrally sensitized with a

Details Silver halide photographic elements spectrally sensitized with a Silver halide photographic elements spectrally sensitized with a

1975-03-05

1977-05-24

Brown, J. Travis

Gas separation: apparatus

Solid sorbent apparatus

Soluble or deliquescent type

96129, 96139, 2602401, G03C 102, G03C 110

Patent

active

040253490

ABSTRACT:
Novel methyne dyes comprising two auxochromic groups of the type used in a cyanine or merocyanine dye linked by a carbon atom chain wherein each of the carbon atoms have an unsaturated linkage to at least one adjacent carbon atom in the chain and at least one pair of carbon atoms in the chain being joined by a triple bond or, in an alternate resonance form, the chain including three consecutive carbon to carbon double bonds. The dyes are useful as spectral sensitizing dyes for silver halide emulsions and as intermediates for synthesizing chain-substituted methine dyes.

REFERENCES:
patent: 3189459 (1965-06-01), Burness
patent: 3212900 (1965-10-01), Oguchi et al.
patent: 3414568 (1968-12-01), Collet et al.
patent: 3822134 (1974-07-01), Rasch et al.
Mees and James, The Theory of the Photographic Process, Third Edition, pp. 256-261, Macmillan Co., New York, (1966).

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