Patent US4565776A successfully refreshed from Google Patents.
US4565776A
Expired / Lapsed
US
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Photographic developer composition
Assignee: Philip A Hunt Chemical Corp
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Filing: 1985-04-29
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Granted: 1986-01-21
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Expires: 2005-04-29
Abstract
Abstract Oxidation inhibiting amounts of alkylated diphenyl oxide disulfonates are incorporated into photographic color developers containing primary aromatic amino color developing agents to increase clarity and inhibit the formation of tar-like precipitates in these developers. Typical disulfonates include sodium dodecyl diphenyl ether disulfonate, sodium decyl diphenyl ether disulfonate, sodium cetyl diphenyl ether disulfonate, monocetyl diphenyl ether disulfonate, dicetyl diphenyl ether disulfonate and mixtures thereof. The use of disulfonates of this type substantially eliminates the need for cosolvents such as alkanolamines to inhibit the formation of tar-like particles in the developers.
Inventors
- 👤 Hongzoon Kim
- 👤 Thomas E. Salamy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:40
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A photographic color developer composition comprising, (1) a primary aromatic amino color developing agent and, (2) an oxidation inhibiting amount of an alkylated diphenyl oxide disulfonate represented by the formula: ##STR3## where R is a linear or branched alkyl group of between about 8 and about 20 carbon atoms, where R 1 is R or hydrogen, and where X is an alkali metal or hydrogen.
Claim 2
Dependent Claim
65 words
A photographic color developer composition comprising, (1) a primary aromatic amino color developing agent and, (2) an oxidation inhibiting amount of an alkylated diphenyl oxide disulfonate represented by the formula: ##STR3## where R is a linear or branched alkyl group of between about 8 and about 20 carbon atoms, where R 1 is R or hydrogen, and where X is an alkali metal or hydrogen.
Claim 3
Dependent Claim
42 words
The developer composition of claim 1 wherein said disulfonate is selected from the group consisting of sodium dodecyl diphenyl ether disulfonate, sodium decyl diphenyl ether disulfonate, sodium cetyl diphenyl ether disulfonate, monocetyl diphenyl ether disulfonate, dicetyl diphenyl ether disulfonate and mixtures thereof.
Claim 4
Dependent Claim
29 words
The developer composition of claim 2 wherein said oxidation inhibiting amount of said disulfonate is from between about 0.1 and about 20 grams per liter of said developer composition.
Claim 5
Dependent Claim
29 words
The developer composition of claim 2 wherein said oxidation inhibiting amount of said disulfonate is from between about 0.2 and about 10 grams per liter of said developer composition.
Claim 6
Dependent Claim
25 words
The developer composition of claim 3 wherein said developing agent is selected from the group consisting of the sulfate, phosphate, and chloride salts of 4-amino-N-ethyl-N-(β-methanesulfonamido-ethyl)-m-toluidine.
Claim 7
Dependent Claim
13 words
The developer composition of claim 3 wherein said developing agent is 4-amino-N-ethyl-N-(β-methanesulfonamidoethyl)-m-toluidine monophosphatemonomethanolate.
Claim 8
Dependent Claim
13 words
The developer composition of claim 4 wherein said developing agent is 4-amino-N-ethyl-N-(β-methanesulfonamidoethyl)-m-toluidine sulfate.
Claim 9
Dependent Claim
15 words
The developer composition of claim 4 wherein said disulfonate is sodium dodecyl diphenyl ether disulfonate.
Claim 10
Dependent Claim
15 words
The developer composition of claim 4 wherein said disulfonate is sodium decyl diphenyl ether disulfonate.
Claim 11
Dependent Claim
15 words
The developer composition of claim 4 wherein said disulfonate is sodium cetyl diphenyl ether disulfonate.
Claim 12
Dependent Claim
41 words
The process for inhibiting the oxidation of a primary aromatic amino color developing agent in a photographic color developer composition which comprises admixing with said developer composition an oxidation inhibiting amount of alkylated diphenyl oxide disulfonate represented by the formula: ##STR4##
Claim 13
Dependent Claim
41 words
The process for inhibiting the oxidation of a primary aromatic amino color developing agent in a photographic color developer composition which comprises admixing with said developer composition an oxidation inhibiting amount of alkylated diphenyl oxide disulfonate represented by the formula: ##STR4##
Claim 14
Dependent Claim
40 words
The process of claim 11 wherein said disulfonate is selected from the group consisting of sodium dodecyl diphenyl ether disulfonate, sodium decyl diphenyl ether disulfonate, sodium cetyl diphenyl ether disulfonate,monocetyl diphenyl ether disulfonate, dicetyl diphenyl ether disulfonate and mixtures thereof.
Claim 15
Dependent Claim
28 words
The process of claim 12 wherein said oxidation inhibiting amount of said disulfonate is from between about 0.1 and about 20 grams per liter of said developer composition.
Claim 16
Dependent Claim
28 words
The process of claim 12 wherein said oxidation inhibiting amount of said disulfonate is from between about 0.2 and about 10 grams per liter of said developer composition.
Claim 17
Dependent Claim
24 words
The process of claim 13 wherein said developing agent is selected from the group consisting of the sulfate, phosphate, and chloride salts of 4-amino-N-ethyl-N-(β-methanesulfonamido-ethyl)-m-toluidine.
Claim 18
Dependent Claim
13 words
The process of claim 14 wherein said developing agent is 4-amino-N-ethyl-N-(β-methanesulfonamidoethyl)-m-toluidine monophosphate monomethanolate.
Claim 19
Dependent Claim
12 words
The process of claim 14 wherein said developing agent is 4-amino-N-ethyl-N-(β-methanesulfon-amidoethyl)-m-toluidine sulfate.
Claim 20
Dependent Claim
14 words
The process of claim 14 wherein said disulfonate is sodium dodecyl diphenyl ether disulfonate.
Claim 21
Dependent Claim
14 words
The process of claim 14 wherein said disulfonate is sodium decyl diphenyl ether disulfonate.
Claim 22
Dependent Claim
14 words
The process of claim 14 wherein said disulfonate is sodium cetyl diphenyl ether disulfonate.
References Cited (Backward Citations)
US2618558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |