EP0039752A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photographic color developer solutions
Assignee: Eastman Kodak Co
•
Filing: 1980-12-10
•
Granted: —
•
Expires: 2000-12-10
Abstract
Abstract A poly(alkyleneimine), such as poly(ethyleneimine), in a photographic color developer solution containing a primary aromatic amino color developing agent protects the developing agent against aerial oxidation. The poly(alkyleneimine) also functions to reduce tar formation and retard stain growth and provides a supplemental source of alkalinity in the color developer solution.
Inventors
- 👤 Nelson S. Case
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:30
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/396; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
A photographic color developer solution comprising a primary aromatic amino color developing agent and an anti-oxidant for the developing agent, characterized in that the anti-oxidant comprises a poly(alkyleneimine).
Claim 2
Dependent Claim
28 words
A photographic color developer solution comprising a primary aromatic amino color developing agent and an anti-oxidant for the developing agent, characterized in that the anti-oxidant comprises a poly(alkyleneimine).
Claim 3
Dependent Claim
35 words
A photographic color developer solution according to Claim 1 wherein the poly(alkyleneimine) has the formula (R-NH) where R is an alkylene radical having 2 to 4 carbon atoms and x is from 500 to 2,000.
Claim 4
Dependent Claim
17 words
A photographic color developer solution according to Claim 1 or 2 wherein the poly(alkyleneimine) is a poly(ethyleneimine).
Claim 5
Dependent Claim
18 words
A photographic color developer solution according to any of the preceding claims wherein the anti-oxidant comprises an hydroxylamine.
Claim 6
Dependent Claim
75 words
A photographic color developer solution according to Claim 4 wherein the anti-oxidant comprises per mole of the color developing agent from 1 to 8 moles of an hydroxylamine of the formula: wherein R 1 and R 2 are independently a hydrogen atom or an alkyl group of 1 to 3 carbon atoms (or of a water-soluble acid salt thereof), from 6 to 1200 grams of the poly(alkyleneimine), and from 0 to 0.25 mole of sulfite.
Claim 7
Dependent Claim
17 words
A photographic color developer solution according to Claim 4 or 5 wherein the hydroxylamine is hydroxylamine sulfate.
Claim 8
Dependent Claim
29 words
A process of color developing a photographic silver halide element which comprises contacting the element with a color developer solution according to any one of Claims 1 to 6.
References Cited (Backward Citations)
US3578454A
Cited
US3615498A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.