US4252892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic color developer compositions
Assignee: Eastman Kodak Co
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Filing: 1979-12-10
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Granted: 1981-02-24
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Expires: 1999-12-10
Abstract
Abstract A poly(alkyleneimine), such as poly(ethyleneimine), is incorporated in a photographic color developer composition containing a primary aromatic amino color developing agent in order to protect 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 composition.
Inventors
- 👤 Nelson S. Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/396; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
20 words
A photographic color developer composition comprising a primary aromatic amino color developing agent and an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 2
Dependent Claim
20 words
A photographic color developer composition comprising a primary aromatic amino color developing agent and an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 3
Dependent Claim
19 words
A photographic color developer composition comprising a primary aromatic amino color developing agent and an oxidation-inhibiting amount of poly(ethyleneimine).
Claim 4
Dependent Claim
19 words
A photographic color developer composition comprising a primary aromatic amino color developing agent and an oxidation-inhibiting amount of poly(ethyleneimine).
Claim 5
Dependent Claim
22 words
A photographic color developer composition comprising a primary aromatic amino color developing agent, an hydroxylamine, and an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 6
Dependent Claim
22 words
A photographic color developer composition comprising a primary aromatic amino color developing agent, an hydroxylamine, and an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 7
Dependent Claim
96 words
A photographic color developer composition comprising a primary aromatic amino color developing agent, from about 1 to about 8 moles per mole of said developing agent of an hydroxylamine of the formula: ##STR3## wherein R 1 and R 2 are independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 3 carbon atoms, or a water-soluble acid salt thereof, from about 6 to about 1200 grams per mole of said developing agent of a poly(alkyleneimine), and from zero to 0.25 moles of sulfite per mole of said developing agent.
Claim 8
Dependent Claim
96 words
A photographic color developer composition comprising a primary aromatic amino color developing agent, from about 1 to about 8 moles per mole of said developing agent of an hydroxylamine of the formula: ##STR3## wherein R 1 and R 2 are independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 3 carbon atoms, or a water-soluble acid salt thereof, from about 6 to about 1200 grams per mole of said developing agent of a poly(alkyleneimine), and from zero to 0.25 moles of sulfite per mole of said developing agent.
Claim 9
Dependent Claim
16 words
A photographic color developer composition as claimed in claim 1 wherein said developing agent is p-phenylenediamine.
Claim 10
Dependent Claim
17 words
A photographic color developer compositon as claimed in claim 1 wherein said developing agent is an aminophenol.
Claim 11
Dependent Claim
18 words
A photographic color developer composition as claimed in claim 1 wherein said developing agent is 4-(N-ethyl-N-2-methanesulfonylaminoethyl)-2-methylphenylenediamine sesquisulfate monohydrate.
Claim 12
Dependent Claim
16 words
A photographic color developer composition as claimed in claim 1 which is free of sulfite ions.
Claim 13
Dependent Claim
44 words
A photographic color developer composition as claimed in claim 3 wherein said hydroxylamine has the formula: ##STR4## wherein R 1 and R 2 are independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 3 carbon atoms.
Claim 14
Dependent Claim
16 words
A photographic color developer composition as claimed in claim 3 wherein said hydroxylamine is hydroxylamine sulfate.
Claim 15
Dependent Claim
18 words
A photographic color developer composition as claimed in claim 1 wherein said composition is an aqueous alkaline composition.
Claim 16
Dependent Claim
17 words
A photographic color developer composition as claimed in claim 1 wherein said composition is an acidic concentrate.
Claim 17
Independent Claim
43 words
A method of retarding aerial oxidation of a primary aromatic amino color developing agent in a photographic color developing solution so as to increase the useful life of said solution, which method comprises incorporating in said solution an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 18
Independent Claim
43 words
A method of retarding aerial oxidation of a primary aromatic amino color developing agent in a photographic color developing solution so as to increase the useful life of said solution, which method comprises incorporating in said solution an oxidation-inhibiting amount of a poly(alkyleneimine).
Claim 19
Dependent Claim
12 words
A method as claimed in claim 13 wherein said poly(alkyleneimine) is poly(ethyleneimine).
Claim 20
Dependent Claim
14 words
A method as claimed in claim 13 wherein said developing solution contains an hydroxylamine.
Claim 21
Dependent Claim
26 words
A method as claimed in claim 13 wherein said developing solution contains hydroxylamine sulfate, said developing agent is 4-(N-ethyl-N-2-methanesulfonylaminoethyl)-2-methylphenylenediamine sesquisulfate monohydrate, and said poly(alkyleneimine) is poly(ethyleneimine).
Claim 22
Dependent Claim
33 words
A process of color developing a photographic element which comprises contacting said element with a color developer solution containing a primary aromatic amino color developing agent stabilized against aerial oxidation with a poly(alkyleneimine).
Claim 23
Dependent Claim
33 words
A process of color developing a photographic element which comprises contacting said element with a color developer solution containing a primary aromatic amino color developing agent stabilized against aerial oxidation with a poly(alkyleneimine).
Claim 24
Dependent Claim
12 words
A process as claimed in claim 17 wherein said poly(alkyleneimine) is poly(ethyleneimine).
Claim 25
Dependent Claim
14 words
A process as claimed in claim 17 wherein said developing solution contains an hydroxylamine.
Claim 26
Dependent Claim
26 words
A process as claimed in claim 17 wherein said developing solution contains hydroxylamine sulfate, said developing agent is 4-(N-ethyl-N-2-methanesulfonylaminoethyl)-2-methylphenylenediamine sesquisulfate monohydrate, and said poly(alkyleneimine) is poly(ethyleneimine).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |