Patent · US Expired

Color photographic developer concentrate

US6251573A · kind A · utility

2Cited by

1References

8Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Gustav Tappe · Leverkusen, DE
Wolfgang Korner · Leverkusen, DE

Key dates

Filing date	Apr 7, 2000
Grant date	Jun 26, 2001
Priority date	—
Expiry date	Apr 7, 2020

Classification

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

Abstract

A one-part color developer concentrate which comprises at least two phases and which is free from precipitates at 20.degree. C., which contains at least one color developer substance, at least one antioxidant, at least one anti-lime agent, a buffer system and alkali, one phase of which is aqueous and the other phase of which is organic, wherein the aqueous phase has a pH of at least 9, is obtained when the concentrate has a concentration of cations from 0.5 to 15 mol/l, wherein at least 10 mol % of the cations are sodium ions and the organic phase is formed from one or more water-soluble solvents, and wherein 50 to 95% by weight of the sum of water and water-soluble solvents is water.

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