Patent · US Expired

Color photographic developer concentrate

US6468724B2 · kind B2 · utility

0Cited by

4References

7Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Gustav Tappe · Leverkusen, DE
Matthias Porger · Recklinghausen, DE

Key dates

Filing date	Jun 7, 2001
Grant date	Oct 22, 2002
Priority date	—
Expiry date	Jun 7, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG03C2200/44
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A two-part color photographic developer concentrate in which part 1 contains at least one antioxidant selected from the group consisting of diethylhydroxylamine and diethylhydroxylamine disulfo acid, at least one auxiliary solvent, at least one optical brightener and at least one color developer substance and part 2 contains at least one buffer substance, alkali and at least one water softener, may be produced by part 1 additionally containing 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per liter of concentrate concentrate and at least 20% by weight of the total of part 1 being water.

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