High contrast photographic emulsions and elements and processes

Details High contrast photographic emulsions and elements and processes High contrast photographic emulsions and elements and processes

1979-07-12

1987-03-17

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Developing

430437, 430439, 430440, 430446, 430448, 430481, 430482, 430487, 430490, 430567, 430598, 430600, G03C 110, G03C 530, G03C 134

Patent

active

046507469

ABSTRACT:
This invention relates to a photographic element comprising a support, and coated on the support at least one negative-working photographic emulsion comprising radiation-sensitive silver halide grains capable of forming a surface latent image and a binder, and in the support or in a remaining hydrophilic colloid layer coated on the support in an amount sufficient to increase contrast, a hydrazine compound of the formula ##STR1## wherein R.sup.1 is a phenyl nucleus having a Hammet sigma value-derived electron withdrawing characteristic of less than +0.30.

REFERENCES:
patent: 2410690 (1946-11-01), Smith
patent: 2419974 (1947-05-01), Stauffer et al.
patent: 2419975 (1947-05-01), Trivelli
patent: 2892715 (1959-06-01), Hunsberger
patent: 3227552 (1966-01-01), Whitmore
patent: 3340058 (1967-09-01), von Konig
patent: 3386831 (1968-06-01), Honig
patent: 3447927 (1969-06-01), Bacon
patent: 3730727 (1973-05-01), Olivares et al.
patent: 3782949 (1974-01-01), Olivares et al.
patent: 3793027 (1974-02-01), Okutsu et al.
patent: 4168977 (1979-09-01), Takada et al.
patent: 4224401 (1980-09-01), Takada et al.
Smith & Trivelli; "The Influence of Photographic Developers Containing Hydrazine Upon the Characteristic Curves of Photographic Materials," Journal of Franklin Institute, vol. 238, Oct. 1944 pp. 291-298.

Affiliated with

Also associated with

Rating

High contrast photographic emulsions and elements and processes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High contrast photographic emulsions and elements and processes , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High contrast photographic emulsions and elements and processes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1788334