US4378424A
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US
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Mesoionic 1,2,4-triazolium-3-thiolates as silver halide stabilizers and fixing agents
Assignee: Eastman Kodak Co
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Filing: 1981-11-24
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Granted: 1983-03-29
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Expires: 2001-11-24
Abstract
Abstract Mesoionic 1,2,4-triazolium-3-thiolates are silver halide stabilizers and fixing agents. They are useful in heat developable and heat stabilizable photographic silver halide materials and processes. After imagewise exposure of the photographic materials, developed and stabilized silver images are produced by heating the materials. The mesoionic 1,2,4-triazolium-3-thiolates are also silver halide stabilizers and fixing agents in photographic silver halide processing compositions.
Inventors
- 👤 Henry W. Altland
- 👤 Edward L. Dedio
- 👤 Gary J. McSweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/43; G03C5/00; G03C5/26; G03C5/38; G03C1/34; G03C1/346; Y; Y10; Y10S; Y10S430/00; Y10S430/156
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
In a heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in binder: (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
Claim 2
Dependent Claim
56 words
In a heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in binder: (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
Claim 3
Dependent Claim
113 words
A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said mesoionic 1,2,4-triazolium-3-thiolate consists essentially of a compound represented by the formula: ##STR14## wherein R 1 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, or cycloalkyl containing 3 to 12 carbon atoms; R 2 is amino, alkenyl containing 3 to 18 carbon atoms, alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, cycloalkyl containing 3 to 12 carbon atoms, or alkoxyalkyl containing 2 to 18 carbon atoms; and R 3 is alkyl containing 1 to 9 carbon atoms or aryl containing 6 to 12 carbon atoms.
Claim 4
Dependent Claim
22 words
A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said mesoionic 1,2,4-triazolium-3-thiolate consists essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 5
Dependent Claim
21 words
A heat developable and heat stabilizable photographic silver halide element as in claim 1 wherein said binder consists essentially of gelatin.
Claim 6
Dependent Claim
66 words
A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver bromide; (b) a photographic silver bromide developing agent; (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound; and (d) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate stabilizer precursor consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 7
Dependent Claim
66 words
A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder: (a) photographic silver bromide; (b) a photographic silver bromide developing agent; (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound; and (d) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate stabilizer precursor consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 8
Dependent Claim
47 words
In a heat developable and heat stabilizable photographic silver halide composition comprising (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
Claim 9
Dependent Claim
47 words
In a heat developable and heat stabilizable photographic silver halide composition comprising (a) photographic silver halide, (b) a photographic silver halide developing agent, (c) an activating concentration of a thermal base releasing compound, the improvement comprising (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
Claim 10
Dependent Claim
113 words
A heat developable and heat stabilizable photographic silver halide composition as in claim 6 wherein said mesoionic 1,2,4-triazolium-3-thiolate consists essentially of a compound represented by the formula: ##STR15## wherein R 1 is alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, or cycloalkyl containing 3 to 12 carbon atoms; R 2 is amino, alkenyl containing 3 to 18 carbon atoms, alkyl containing 1 to 18 carbon atoms, aryl containing 6 to 20 carbon atoms, cycloalkyl containing 3 to 12 carbon atoms, or alkoxyalkyl containing 2 to 18 carbon atoms; and R 3 is alkyl containing 1 to 9 carbon atoms or aryl containing 6 to 12 carbon atoms.
Claim 11
Dependent Claim
22 words
A heat developable and heat stabilizable photographic silver halide composition as in claim 6 wherein said mesoionic 1,2,4-triazolium-3-thiolate consists essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 12
Dependent Claim
18 words
A heat developable and heat stabilizable photographic silver halide composition as in claim 6 also comprising a binder.
Claim 13
Dependent Claim
19 words
A heat developable and heat stabilizable photographic silver halide composition as in claim 6 also comprising a gelatino binder.
Claim 14
Dependent Claim
59 words
A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver bromide; (b) a photographic silver bromide developing agent; (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound; and (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 15
Dependent Claim
59 words
A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder: (a) photographic silver bromide; (b) a photographic silver bromide developing agent; (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound; and (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
Claim 16
Dependent Claim
43 words
A process of developing and stabilizing an image in an exposed photographic element as defined in claim 1 comprising heating said element to a temperature within the range of about 100° C. to about 180° C. until said image is developed and stabilized.
Claim 17
Dependent Claim
86 words
A process of developing and stabilizing an image in an exposed photographic silver halide element comprising a support having thereon, in a gelatino binder: (a) photographic silver halide; (b) a photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound, and (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate, said process comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed and stabilized.
Claim 18
Dependent Claim
86 words
A process of developing and stabilizing an image in an exposed photographic silver halide element comprising a support having thereon, in a gelatino binder: (a) photographic silver halide; (b) a photographic silver halide developing agent; (c) an activating concentration of a thermal base releasing compound, and (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate, said process comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed and stabilized.
Claim 19
Dependent Claim
20 words
A photographic silver halide fixing composition comprising a silver halide fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and an organic acid.
Claim 20
Dependent Claim
20 words
A photographic silver halide fixing composition comprising a silver halide fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and an organic acid.
Claim 21
Dependent Claim
21 words
A photographic silver halide fixing solution comprising, in an aqueous solvent, a fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and acetic acid.
Claim 22
Dependent Claim
21 words
A photographic silver halide fixing solution comprising, in an aqueous solvent, a fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and acetic acid.
Claim 23
Dependent Claim
17 words
A photographic silver halide fixing composition comprising a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
Claim 24
Dependent Claim
17 words
A photographic silver halide fixing composition comprising a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
Claim 25
Dependent Claim
21 words
A photographic silver halide fixing solution comprising, in an aqueous solvent, a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
Claim 26
Dependent Claim
21 words
A photographic silver halide fixing solution comprising, in an aqueous solvent, a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |