Patent · US Expired

Photographic color developer composition

US4142895A · kind A · utility

3Cited by

10References

13Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Karl Frank · Linz, DE
Arnfried Melzer · Cologne, DE

Key dates

Filing date	Jan 5, 1978
Grant date	Mar 6, 1979
Priority date	—
Expiry date	Jan 5, 1998

Classification

Technology area (CPC G)Physics
CPC primaryG03C5/305
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A color developer composition is provided which has substantially improved protection against oxidation of the color developer and excellent sequestering properties characterized in that the composition comprises an .alpha.-aminocarbonyl compound, an organo-phosphonic acid and an aminocarboxylic acid.

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