Direct positive silver halide emulsions containing quaternated m

Details Direct positive silver halide emulsions containing quaternated m Direct positive silver halide emulsions containing quaternated m

1975-12-03

1977-07-12

Brown, J. Travis

Gas separation: apparatus

Solid sorbent apparatus

Plural solid sorbent beds

96101, 96139, 96140, 2602401, G03C 110

Patent

active

040351904

ABSTRACT:
Quaternated merocyanine dyes for spectrally sensitizing direct positive silver halide emulsions having a first heterocyclic nucleus selected from the group consisting of a 2-isoxazolin-3-furyl-5-one, a 2-isoxazolin-3-thienyl-5-one, a 2-isoxazolin-3-pyrryl-5-one, a 2-pyrazolin-3-furyl-5-one, a 2-pyrazolin-3-thienyl-5-one and a 2-pyrazolin-3-pyrryl-5-one nucleus, linked at the 4-carbon atom thereof through a methine chain to a second heterocyclic nucleus for completing the said quaternated merocyanine dye.

REFERENCES:
patent: 2394068 (1946-02-01), Kendall et al.
patent: 3539349 (1970-11-01), Brooker et al.
patent: 3579344 (1971-05-01), Webster

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