Patent US3779757A successfully refreshed from Google Patents.
US3779757A
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Silver complex diffusion transfer process utilizing an aromatic disulfide
Assignee: Agfa Gevaert NV
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Filing: 1972-01-11
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Granted: 1973-12-18
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Expires: 1992-01-11
Abstract
Abstract A method of stabilizing the image-tone of silver images formed according to the silver complex diffusion transfer process is described, which comprises either carrying out the diffusion transfer process in the presence of an aliphatic, aromatic or heterocyclic disulphide having at least one water-solubilizing group in acid or salt form or treating the image-receiving element subsequent to the formation therein of the silver complex diffusion transfer image with a solution of the said disulphide.
Inventors
- 👤 E Hofman
- 👤 R Pollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:10
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C8/24; G03C8/243
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
Method according to claim 1 wherein said disulphide is present in at least one water-permeable layer of said light-sensitive element.
Claim 2
Dependent Claim
20 words
Method according to claim 1 wherein said disulphide is present in at least one water-permeable layer of said image-receiving element.
Claim 3
Dependent Claim
24 words
Method according to claim 1 wherein said disulphide is present in an aqueous solution with which said silver image is contacted after its formation.
Claim 4
Dependent Claim
63 words
Method according to claim 1 wherein said disulphide corresponds to the formula: X - A1 - S - S - A2 - Y wherein: each of A1 and A2 represents an arylene group, and each of X and Y represents a water-solubilizing carboxyl or sulfo group in acid or salt form, or a substituent carrying such water-solubilizing group in acid or salt form.
Claim 5
Dependent Claim
14 words
Method according to claim 5 wherein each of A1 and A2 stands for phenylene.
Claim 6
Dependent Claim
47 words
A photographic non-light-sensitive image-receiving elemement for use in a silver complex diffusion transfer process comprising in the image-receiving layer or in a layer in water-permeable relationship with said image-receiving layer an aromatic disulphide having at least one water-solubilizing carboxyl or sulfo group in acid or salt form.
Claim 7
Dependent Claim
62 words
An image-receiving element according to claim 26 wherein said disulphide corresponds to the formula: X - A1 - S - S - A2 - Y wherein: each of A1 and A2 represents an arylene group, and each of X and Y represents a water-solubilizing group in acid or salt form, or a substituent carrying such water-solubilizing group in acid or salt form.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |