Cyanoethyl-containing blocked development restrainers

Details Cyanoethyl-containing blocked development restrainers Cyanoethyl-containing blocked development restrainers

1975-06-20

1977-02-22

Klein, David

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 29D, 96 663, 96 73, 96 74, 96 76R, 96 77, 96 95, 96 99, 96100, 96109, G03C 700, G03C 530, G03C 148, G03C 140

Patent

active

040090299

ABSTRACT:
Photographic elements are disclosed which contain a blocked development restrainer which is designed to provide timely release of a development restrainer when the photographic element is processed with an alkaline processing composition. The photographic elements are especially useful in image-transfer film units where the blocked development restrainers will permit initial development to occur and, upon cleavage, will substantially restrain further development.

REFERENCES:
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patent: 2981624 (1961-04-01), Dersch et al.
patent: 3260597 (1966-07-01), Weyerts et al.
patent: 3265498 (1966-08-01), Rogers et al.
patent: 3420664 (1969-01-01), Dersch et al.
patent: 3632345 (1972-01-01), Marx et al.
patent: 3674478 (1972-07-01), Grasshoff et al.
patent: 3698897 (1972-10-01), Gompf et al.
patent: 3756821 (1973-09-01), Hayashi et al.
patent: 3785813 (1974-01-01), Rickter
patent: 3839041 (1974-10-01), Hiller
patent: 3893859 (1975-07-01), Burness et al.
Allen and Humphlett, "The Thermal Reversibility of . . . Reaction. V", Canadian J. of Chem. vol. 44, 1966, pp. 2315-2321.

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