US3751255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive and thermosensitive element, composition and process
Assignee: Eastman Kodak Co
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Filing: 1972-03-24
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Granted: 1973-08-07
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Expires: 1992-03-24
Abstract
Abstract Sulfhydroxamic acids are active developing agents for photographic silver salts in strongly alkaline solutions. They form super additive mixtures with other silver halide developing agents. They may be incorporated in silver halide emulsions and they can be activated by immersion in alkali or by application of heat. They may be used in chemical or physical development such as in diffusion transfer processing.
Inventors
- 👤 I Olivares
- 👤 B Wilson
- 👤 G Haist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:53
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3014
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
42 words
The composition of claim 1 wherein said sulf-hydroxamic acid is represented by the structural formula: RSO2NHOH wherein R is alkyl having one to 12 carbon atoms, aryl having six to 12 carbon atoms or a heterocyclic group having five or six atoms.
Claim 2
Dependent Claim
13 words
A photographic processing composition as in claim 1 comprising an aqueous alkaline solution.
Claim 3
Dependent Claim
14 words
The composition of claim 2 wherein R is 4-methyl phenyl; 4-bromophenyl; 3,4-dichlorophenyl or 2-thiophene.
Claim 4
Dependent Claim
15 words
A photographic processing composition as in claim 1 comprising an auxiliary silver halide developing agent.
Claim 5
Dependent Claim
11 words
A photographic composition of claim 1 comprising a silver halide solvent.
Claim 6
Dependent Claim
19 words
A photographic processing compOsition of claim 6 in which said auxiliary agent is a pyrazolidone silver halide developing agent.
Claim 7
Dependent Claim
27 words
A photographic composition of claim 7 wherein the mole ratio of the sulfhydroxamic acid to pyrazolidone is in the range of from about 1:5 to about 2:1.
Claim 8
Dependent Claim
61 words
A photographic element comprising a support having thereon at least one photographic silver salt layer, and incorporated in said element as a silver salt developing agent, a sulfhydroxamic acid represented by the structural formula: RSO2NHOH wherein R is alkyl having one to 12 carbon atoms, aryl having six to 12 carbon atoms or a heterocyclic group having five to six atoms.
Claim 9
Dependent Claim
13 words
A photographic element of claim 9 which also comprises a pyrazolidone developing agent.
Claim 10
Dependent Claim
16 words
A photographic element of claim 9 wherein said silver salt layer is a silver halide emulsion.
Claim 11
Dependent Claim
18 words
A photographic element of claim 11 wherein said photographic developing agent is present in said silver halide emulsion.
Claim 12
Dependent Claim
21 words
A photographic element as in claim 11 wherein said developing agent is in a layer contiguous to said silver halide layer.
Claim 13
Dependent Claim
34 words
A photographic element as in claim 11 wherein said sulfhydroxamic acid is located in said silver halide emulsion layer and a pyrazolidone developing agent is in a layer contiguous to said silver halide layer.
Claim 14
Dependent Claim
81 words
In a process of developing an exposed photographic element, said element comprising a support having thereon at least one photographic silver salt layer, said process comprising contacting said exposed element with a photographic developing agent and activating said developing agent, the improvement comprising employing a sulfhydroxamic acid developing agent represented by the structural formula: RSO2NHOH wherein R is alkyl having one to 12 carbon atoms, aryl having six to 12 carbon atoms or a heterocyclic group having five to six atoms.
Claim 15
Dependent Claim
17 words
A process as in claim 15 wherein the development process is activated by heating the photographic element.
Claim 16
Dependent Claim
16 words
A process as in claim 15 wherein said developing agent is incorporated in said photographic element.
Claim 17
Dependent Claim
27 words
In a photographic emulsion comprising at least one photographic silver salt and a developing composition, the improvement wherein the developing composition comprises a sulfhydroxamic acid developing agent.
Claim 18
Dependent Claim
41 words
A process of developing an exposed photographic element, said element comprising a support having thereon at least one silver halide emulsion containing a sulfhydroxamic acid developing agent, said process comprising activating development with an activator solution comprising a pyrazolidone developing agent.
References Cited (Backward Citations)
US853643A
Cited
US3179517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |