US3769014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beta-disulfone silver halide solubilizing agents
Assignee: Eastman Kodak Co
•
Filing: 1971-04-19
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Granted: 1973-10-30
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Expires: 1991-04-19
Abstract
Abstract Beta -disulfones are employed as silver halide solubilizing agents for use in fixing compositions, and as silver halide solvents in photographic chemical diffusion transfer processes, photosensitive elements, photographic film units and reception elements.
Inventors
- 👤 P Stewart
- 👤 D Heseltine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:13
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
22 words
The process of claim 1 wherein R1 and R2 each represent methyl, ethyl, hydroxyethyl, carboxymethyl, or carboxyethyl groups and R3 represents H.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein R1 and R2 each represent a methyl group.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said solubilizing agent is present in an amount of from about 3 to about 200 grams per liter of composition.
Claim 4
Dependent Claim
14 words
An aqueous alkaline photographic composition comprising a silver halide solubilizing agent having the formula
Claim 5
Dependent Claim
24 words
A photographic composition as defined in claim 5 wherein R1 and R2 each represent methyl, ethyl, hydroxyethyl,carboxymethyl, or carboxyethyl groups and R3 represents H.
Claim 6
Dependent Claim
17 words
A photographic composition as defined in claim 6 wherein R1 and R2 each represent a methyl group.
Claim 7
Dependent Claim
29 words
A photographic composition as defined in claim 5 wherein said solubilizing agent is present in an amount of from about 3 to about 200 grams per liter of composition.
Claim 8
Dependent Claim
19 words
An aqueous alkaline composition comprising a silver halide developing agent and a silver halide solubilizing agent having the formula
Claim 9
Dependent Claim
26 words
The aqueous alkaline composition as defined in claim 9 wherein R1 and R2 each represent methyl, ethyl, hydroxyethyl, carboxymethyl, or carboxyethyl groups and R3 represents H.
Claim 10
Dependent Claim
16 words
The aqueous alkaline composition as defined in claim 10 wherein R1 and R2 each represent methyl.
Claim 11
Dependent Claim
17 words
The aqueous alkaline composition as defined in claim 11 wherein the silver halide developing agent is hydroquinone.
Claim 12
Dependent Claim
30 words
The aqueous alkaline composition as defined in claim 9 wherein said solubilizing agent is present in an amount of from about 3 to about 200 grams per liter of composition.
Claim 13
Dependent Claim
15 words
The aqueous alkaline composition as defined in claim 9 which also includes a viscosity-increasing material.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |