Patent US3716361A successfully refreshed from Google Patents.
US3716361A
Expired / Lapsed
US
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Process of forming silver transfer images
Assignee: Agfa Gevaert NV
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Filing: 1970-10-12
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Granted: 1973-02-13
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Expires: 1990-10-12
Abstract
Abstract A process for the production of silver images according to the silver complex diffusion transfer process carried out in the presence of a hydroxylamine derivative developing agent and a (poly)amino(poly)carboxylic acid sequestering agent in acid form or in the form of a water-soluble salt is described. Better quality transfer images at substantially lower illumination levels are realized.
Inventors
- 👤 R Thiers
- 👤 J Willems
- 👤 R Spriet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:54
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
In a process of forming silver transfer images which comprises the steps of image-wise exposing a photosensitive element containing a silver halide emulsion layer, developing the exposed silver halide and forming a soluble silver complex of unexposed silver halide by treating the said silver halide emulsion layer with an alkaline processing liquid in the presence of a hydroxylamine developing agent and a silver halide complexing agent, transferring said soluble silver complex by diffusion to an image-receiving element in superposed relationship with said photosensitive element, forming at an image-receiving layer of said image-receiving element an image incorporating silver from said silver complex, and separating said image-receiving element from said photosensitive element, the use of a photosensitive element which includes in the silver halide emulsion layer or a hydrophilic colloid layer in water-permeable relationship with the said emulsion layer a (poly)amino(poly)carboxylic acid compound in the acid form or in the form of a water-soluble salt.
Claim 2
Dependent Claim
153 words
In a process of forming silver transfer images which comprises the steps of image-wise exposing a photosensitive element containing a silver halide emulsion layer, developing the exposed silver halide and forming a soluble silver complex of unexposed silver halide by treating the said silver halide emulsion layer with an alkaline processing liquid in the presence of a hydroxylamine developing agent and a silver halide complexing agent, transferring said soluble silver complex by diffusion to an image-receiving element in superposed relationship with said photosensitive element, forming at an image-receiving layer of said image-receiving element an image incorporating silver from said silver complex, and separating said image-receiving element from said photosensitive element, the use of a photosensitive element which includes in the silver halide emulsion layer or a hydrophilic colloid layer in water-permeable relationship with the said emulsion layer a (poly)amino(poly)carboxylic acid compound in the acid form or in the form of a water-soluble salt.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein said (poly)amino(poly)carboxylic acid corresponds to the formula:
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the said silver halide complexing agent is a cyclic imide.
Claim 5
Dependent Claim
13 words
A process according to claim 3, wherein the said cyclic imide is uracil.
Claim 6
Dependent Claim
39 words
A process according to claim 1, wherein the (poly)amino(poly)carboxylic acid compound is present in the silver halide emulsion layer of the photosensitive element in an amount of from about 30 mg to 15 g per mole of silver halide.
Claim 7
Dependent Claim
15 words
A process according to claim 1, wherein said photosensitive element also includes an 1-aryl-3-pyrazolidinone compound.
Claim 8
Dependent Claim
17 words
A process according to claim 1, wherein said photosensitive element also includes a diamine or polyamine compound.
Claim 9
Dependent Claim
17 words
The process according to claim 1 wherein said (poly)amino(poly)carboxylic acid compound is ethylenediamine,N,N, N'',N''-tetraacetic acid disodium salt.
Claim 10
Dependent Claim
16 words
The process according to claim 1 wherein said (poly)amino(poly)carboxylic acid compound is ethylenediamine,N, N''-di(o-hydroxyphenyl acetic acid).
Claim 11
Dependent Claim
15 words
The process according to claim 1 wherein said (poly)amino(poly)carboxylic acid compound is 2-hydroxyethyl-amino diacetic acid.
Claim 12
Dependent Claim
15 words
The process according to claim 1 wherein said (poly)amino(poly)carboxylic acid compound is ethyleneglycol bis(2-aminoethyl)-N,N,N'',N''-tetraacetic acid.
References Cited (Backward Citations)
US3189454A
Cited
US3458316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |