Direct positive photographic elements containing developers

Details Direct positive photographic elements containing developers Direct positive photographic elements containing developers

1975-02-06

1976-11-23

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Ionizing electrode details

96 64, G03C 106, G03C 524

Patent

active

039934900

ABSTRACT:
Direct positive film with incorporated developer having improved sensitometric properties and storage stability is obtained with a developer combination of hydroquinone monosulfonate and a superadditive developer of the 3-pyrazolidone or the N-methyl-p-aminophenol sulfate types.

REFERENCES:
patent: 2675318 (1958-04-01), Russell et al.
patent: 3615517 (1971-10-01), Milton et al.
patent: 3632340 (1972-01-01), Illingsworth
patent: 3690891 (1972-09-01), Spence
patent: 3733198 (1973-05-01), Vanreusel et al.
patent: 3816135 (1973-06-01), Hunt
Axford, "Exhaustion of Phenidone Developers by Aeration, and the Superadditivity of Phenidone C HQ Monosulphonate," 1959, Journal of Photographic Science, vol. 7, pp. 120-125.

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