Direct-positive process utilizing a supersensitized silver halid

Details Direct-positive process utilizing a supersensitized silver halid Direct-positive process utilizing a supersensitized silver halid

1976-05-19

1977-08-09

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96124, 96 95, 96 77, 96100, G03C 524, G03C 128

Patent

active

040408396

ABSTRACT:
A silver halide photographic emulsion containing at least one sensitizing dye of the following general formula (I) and at least one sensitizing dye of general formulae (II) and/or (III), in an amount effective to achieve supersensitization: ##STR1## wherein V.sup.1 and V.sup.2, which may be the same or different, each represents a hydrogen atom, halogen atom, trifluoromethyl, cyano, carboxy, alkoxycarbonyl, aminosulfonyl or alkylsulfonyl; W.sup.1 and W.sup.2, which may be the same or different, each represents a hydrogen atom, halogen atom, alkyl, alkoxy, hydroxy, acyloxy or phenyl; R.sup.1 represents alkyl or substituted alkyl; R.sup.2 and R.sup.3, which may be the same or different, each represents alkyl or substituted alkyl, and at least one of R.sup.2 and R.sup.3 represents 1 or 0; substituted alkyl containing a carboxy or sulfo radical; R.sup.4 and R.sup.5, which may be the same or different, each has the same meanings as R.sup.1 ; X.sup.- represents an acid anion; and m represents ##STR2## wherein V.sup.3 and V.sup.4, which may be the same or different, each has the same meaning as V.sup.1 and V.sup.2 ; W.sup.3 and W.sup.4, which may be the same or different, each has the same meaning as W.sup.1 and W.sup.2 ; R.sup.6 has the same meaning as R.sup.1 ; R.sup.7 and R.sup.8, which may be the same or different, each has the same meaning as R.sup.2 and R.sup.3 ; X.sup.- represents an acid anion; and n represents 1 or 0; ##STR3## wherein W.sup.5 and W.sup.6, which may be the same or different, each has the same meaning as W.sup.3 and W.sup.4 ; R.sup.10 and R.sup.11, which may be the same or different, each has the same meaning as R.sup.2 and R.sup.3 ; R.sup.9 represents an alkyl group; X.sup.- represents an acid anion; and p represents 1 or 0.

REFERENCES:
patent: 2497875 (1950-02-01), Fallesen
patent: 3206313 (1965-09-01), Porter et al.
patent: 3628964 (1971-12-01), Shiba et al.
patent: 3761266 (1973-09-01), Milton
patent: 3761267 (1973-09-01), Gilman et al.
patent: 3873324 (1975-03-01), Hinata et al.

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