Patent · US Expired

Direct-positive emulsion containing fogged, silver halide grains of silver iodide content

US4287296A · kind A · utility

3Cited by

9References

14Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Willy Joseph Vanassche · Aartselaar, BE
Herman Alberik Pattyn · Kapellen, BE
Erik Moisar · Cologne, DE
Sieghart Klotzer · Cologne, DE

Key dates

Filing date	Nov 20, 1973
Grant date	Sep 1, 1981
Priority date	—
Expiry date	Nov 20, 1993

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/48515
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Direct positive silver halide emulsions are provided which contain fogged silver halide grains the said grains being heterodisperse and containing silver iodide in an amount of more than 10 mole % and at most 20 mole % relative to the total amount of silver halide. The emulsions have increased sensitivity and reduced gradation which is suitable for continuous tone reproduction.

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