Patent · US Expired

Production of a silver halide emulsion

US4992362A · kind A · utility

1Cited by

3References

6Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Franz Moll · Leverkusen, DE
Bruno Mucke · Bensberg, DE
Klaus Wagner · Bensberg, DE
Herbert Gareis · Eberbach, DE
Wolfgang Graesser · Eberbach, DE
Peter Koepff · Heidelberg, DE

Key dates

Filing date	Aug 4, 1989
Grant date	Feb 12, 1991
Priority date	—
Expiry date	Aug 4, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/047
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The production of a photosensitive silver halide emulsion by precipitation of the silver halide in the presence of gelatine, flocculation and washing of the silver halide precipitated in the presence of the gelatine and redispersion with addition of more gelatine, precipitation being carried out in the presence of a gelatine having a gold number of at most 10 .mu.mol/g gelatine and a cysteine content of at most 6 ppm and redispersion being carried out with a gelatine having a gold number of at least 23 .mu.mol/g gelatine, leads to an emulsion of uniform grain distribution in which undesirably high fogging is avoided.

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