Patent · US Expired

Colour print material with variable gradation

US5547818A · kind A · utility

1Cited by

7References

13Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Otto Lapp · Leverkusen, DE
Arno Schmuck
Wolfgang Schmidt
J org Siegel · Leverkusen, DE

Key dates

Filing date	Nov 1, 1994
Grant date	Aug 20, 1996
Priority date	—
Expiry date	Nov 1, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/158
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A color photographic print material with the usual three different sensitized silver halide emulsion layers and at least one silver halide emulsion layer containing no color coupler (control layer) with a spectral sensitization range outside the sensitization range of the image-producing layers, wherein the control layer contains a substance A, which, on negative development of the silver halide emulsion used in the control layer (control emulsion), releases a compound B which alters the gradation of the image-producing layers, is usable as a print material with variable gradation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.