Patent · US Expired

Process for the production of color photographic images comprising replenishing the developing solution

US5004676A · kind A · utility

10Cited by

10References

3Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Heinz Meckl · Bensberg, DE
Sieghart Klotzer · Cologne, DE
Erich Wolff · Solingen, DE
Helmut Haseler · Leverkusen, DE

Key dates

Filing date	Feb 14, 1990
Grant date	Apr 2, 1991
Priority date	—
Expiry date	Feb 14, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG03C7/413
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A new process for maintaining the properties of the developer in the preparation of colored images by development of exposed silver halide-containing material at an alkaline pH in a developer bath containing p-phenylenediamine derivative and at least 40 mol-% of the silver halide consisting of silver chloride and replenishing the color developer in the bath in such a limited quantity that no overflow occurs but it is sufficient to make up for the loss of bath constituents. This process preserves the sensitive results from development during use of the developer bath.

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