US3658535A
Expired / Lapsed
US
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Photography
Assignee: Agfa Gevaert NV
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Filing: 1968-11-27
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Granted: 1972-04-25
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Expires: 1988-11-27
Abstract
Abstract The method of rendering silver halides developable in photographic elements by treating the elements with a processing liquid comprising a tin(II)chelate of a (poly)amino(poly)carboxylic acid in acid form or in the form of a water-soluble salt is described. The aforesaid tin(II)chelates have good chemical fogging action forming developable specks in a light-sensitive silver halide material and remain stable in alkaline solutions permitting their incorporation in a developer solution eliminating need of an independent processing bath.
Inventors
- 👤 Jozef Frans Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
12 words
The method of claim 1 wherein said photographic element is simultaneously developed.
Claim 2
Dependent Claim
12 words
The method of claim 1 wherein said photographic element is subsequently developed.
Claim 3
Independent Claim
46 words
A method of producing an image which comprises developing a photographic element comprising unexposed image-wise distributed, silver halide in the presence of a fogging agent consisting essentially of a tin(II)chelate of a (poly)amino(poly) carboxylic acid in acid form or in the form of a water-soluble salt.
Claim 4
Dependent Claim
16 words
A method according to claim 4, wherein the said (poly)amino(poly) carboxylic acid corresponds to the formula:
Claim 5
Dependent Claim
69 words
A method of producing an image according to claim 4, wherein said photographic element includes a reversal black-and-white material and includes the steps of first developing the exposed silver halide with a black-and-white developer; eliminating the developed silver image thus leaving an image-wise distribution of unexposed and undeveloped silver halide, and thereafter developing the residual unExposed silver halide with a black-and-white developer using said tin(II)chelate as the fogging means.
Claim 6
Dependent Claim
20 words
A method according to claim 6, wherein the developed silver image is eliminated by treatment in a photographic bleach bath.
Claim 7
Dependent Claim
13 words
A method according to claim 7 wherein said bleach bath contains potassium dichromate.
Claim 8
Dependent Claim
17 words
A method according to claim 6, wherein the said tin(II)chelate is present in said second black-and-white developer.
Claim 9
Dependent Claim
30 words
A method according to claim 9, wherein the said tin(II)chelate is present in the said second black-and-white developer in an amount comprised between 10 mg and 10 g per liter.
Claim 10
Dependent Claim
75 words
A method of producing an image according to claim 4, which comprises the steps of image-wise exposing a light-sensitive silver halide reversal color material and developing the exposed silver halide in a black-and-white developer thus leaving an image-wise distribution of un-exposed and undeveloped silver halide, developing the residual unexposed silver halide in a color developer in the presence of a color coupler and in the presence of a said tin(II)chelate, and eliminating the developed silver.
Claim 11
Dependent Claim
22 words
A method according to claim 11, wherein the developed silver is eliminated by treatment with a photographic bleach bath comprising potassium hexacyanoferrate(III).
Claim 12
Dependent Claim
16 words
A method according to claim 1, wherein the said tin(II)chelate is present in the color developer.
Claim 13
Dependent Claim
29 words
A method according to claim 11, wherein the said tin(II)chelate is present in the said color developer in an amount comprised between 10 mg and 10 g per liter.
Claim 14
Dependent Claim
41 words
A method according to claim 5, wherein said light-sensitive silver halide reversal color material is a photographic color element comprising a support bearing silver halide emulsion layers containing color couplers and which have been sensitized to different regions of the spectrum.
Claim 15
Dependent Claim
43 words
A method according to claim 15, wherein the said photographic element contains three silver halide emulsion layers, one red-sensitized and containing a cyan-forming color coupler, one green-sensitized and containing a magenta forming color coupler and one blue-sensitive containing a yellow forming color coupler.
Claim 16
Dependent Claim
109 words
A method of producing an image according to claim 4, which comprises the steps of exposing a light-sensitive silver halide color material for the silver-dye bleach process comprising a support bearing at least one silver halide emulsion layer containing an azo dye, developing the exposed silver halide in a black-and-white developer and eliminating the developed silver image thus leaving an image-wise distribution of unexposed and undeveloped silver halide, developing the remaining unexposed silver halide in a second black-and-white developer in the presence of a said tin(II)chelate, and eliminating the developed silver image formed upon said latter development as well as the azo dye in correspondence with said silver image.
Claim 17
Dependent Claim
25 words
A method according to claim 17, wherein the first developed silver image is eliminated by treatment with a silver bleach bath containing an oxidizing agent.
Claim 18
Dependent Claim
13 words
A method according to claim 18, wherein said oxidizing agent is potassium dichromate.
Claim 19
Dependent Claim
26 words
A method according to claim 17, wherein the silver image and azo dye are eliminated after the latter development by treatment with a silver-dye bleach bath.
Claim 20
Dependent Claim
17 words
A method according to claim 17, wherein the said tin(II)chelate is present in the second black-and-white developer.
Claim 21
Dependent Claim
29 words
A method according to claim 21, wherein the said tin(II)chelate is present in the second black-and-white developer in an amount comprised between 10 mg and 10 g per liter.
Claim 22
Dependent Claim
51 words
A method of producing an image according to claim 17, in which the color material for the silver dye bleach process comprises three silver halide emulsion layers, one red-sensitized and containing a cyan azo dye, one green-sensitized and containing a magenta azo dye and one blue-sensitive containing a yellow azo dye.
Claim 23
Dependent Claim
95 words
A method of producing an image according to claim 4, which comprises the steps of processing a multicolor photographic reversal element comprising a support bearing silver halide emulsion layers which have been sensitized to different regions of the spectrum, exposed and developed, to form a reversal color image in all the layers but one thus leaving in the said last layer an image-wise distribution of unexposed and undeveloped silver halide, developing the remaining layer with a color forming developer containing a color coupler in the presence of a said tin(II)chelate, and eliminating the developed silver.
Claim 24
Dependent Claim
38 words
A method according to claim 24, wherein the said tin(II)chelate is present in the last color forming developer or in a processing liquid with which the material is treated immediately prior to the said last color forming development.
Claim 25
Dependent Claim
31 words
A method according to claim 25, wherein the said tin(II)chelate is present in the said last color forming developer in an amount comprised between 10 mg and 10 g per liter.
Claim 26
Dependent Claim
31 words
The method of claim 6 wherein the said tin(II)chelate is present in a processing liquid use to treat said material after the first black-and-white development and before the second black-and-white development.
Claim 27
Dependent Claim
29 words
The method of claim 11 wherein said tin(II)chelate is present in a processing liquid with which the material is treated before the color development and after the black-and-white development.
Claim 28
Dependent Claim
29 words
The method of claim 17 wherein said tin(II)chelate is present in a processing liquid with which the material is treated after the first and before the second black-and-white development.
Claim 29
Independent Claim
69 words
A method of producing a direct-positive image by forming in a silver halide emulsion layer of a photographic element an imagewise distribution of unexposed residual silver halide, rendering this residual silver halide developable in the presence of a chemical fogging agent consisting essentially of a tin(II) chelate of a (poly)amino(poly)carboxylic acid in acid form or in the form of a water-soluble salt and developing the residual developable silver halide.
References Cited (Backward Citations)
US3300306A
Cited
GB991412A
Cited
US3240598A
Cited
US3256092A
Cited
GB990846A
Cited
US3372030A
Cited
US3335004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |