US3647451A
Expired / Lapsed
US
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Antibronzing agents for photographic silver images
Assignee: Agfa Gevaert AG
•
Filing: 1969-03-21
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Granted: 1972-03-07
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Expires: 1989-03-21
Abstract
Abstract Antibronzing agents for silver images dried at high temperatures, which agents have 1,3,4-triazole-3-mercaptan rings bridged together at their 5-positions by an interrupted hydrocarbon linkage.
Inventors
- 👤 Anita Von Konig
- 👤 Helmut Timmler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:39
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C1/00; G03C1/005; G03C1/06; G03C1/35; G03C1/355; Y; Y10; Y10S; Y10S430/00; Y10S430/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
A process as defined in claim 1, wherein the hydrocarbon groups are methylene groups, the number of such groups is not more than six, and the interruptions are oxygen, sulfur or sulfonyl groups.
Claim 2
Dependent Claim
76 words
A photographic element containing at least one light-sensitive silver halide emulsion layer and an antibronzing amount of a compound of the following formula or its tautomeric 3-thione form: wherein: R is hydrogen, a saturated or olefinically unsaturated aliphatic group having up to six carbon atoms, a radical of the phenyl series or an amino group, and X is an interrupted chain of two to 10 hydrocarbon groups, each interruption consisting of O, S, -NH- or SO2.
Claim 3
Dependent Claim
31 words
A material of claim 3 wherein the hydrocarbon groups are methylene groups, the number of such groups is not more than six, and the interruptions are oxygen, sulfur or sulfonyl groups.
Claim 4
Dependent Claim
72 words
An aqueous photographic developer composition containing photographic developer and an antibronzing amount of a compound of the following formula or its tautomeric 3-thione form: wherein: R is hydrogen, a saturated or olefinically unsaturated aliphatic group having up to six carbon atoms, a radical of the phenyl series or an amino group, and X is an interrupted chain of two to 10 hydrocarbon groups, each interruption consisting of O, S, -NH- or SO2.
Claim 5
Dependent Claim
31 words
The developer composition of claim 5 wherein the hydrocarbon groups are methylene groups, the number of such groups is not over six, and the interruptions are oxygen, sulfur or sulfonyl groups.
Claim 6
Dependent Claim
73 words
A photographic fixing bath containing a silver halide solvent and an antibronzing amount of a compound of the following formula or its tautomeric 3-thione form: wherein: R is hydrogen, a saturated or olefinically unsaturated aliphatic group having up to six carbon atoms, a radical of the phenyl seris or an amino group, and X is an interrupted chain of two to 10 hydrocarbon groups, each interruption consisting of O, S, -NH- or SO2.
Claim 7
Dependent Claim
32 words
The fixing bath of claim 7 wherein the hydrocarbon groups are methylene groups, the number of such groups is not more than six, and the interruptions are oxygen, sulfur or sulfonyl groups.
References Cited (Backward Citations)
US2514650A
Cited
US3438777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |