Patent US4468448A successfully refreshed from Google Patents.
US4468448A
Expired / Lapsed
US
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Photographic products and processes
Assignee: Polaroid Corp
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Filing: 1983-06-02
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Granted: 1984-08-28
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Expires: 2003-06-02
Abstract
Abstract This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety comprising a 1,3-sulfur-nitrogen group that undergoes cleavage in the presence of silver ion and/or soluble silver complex, which moiety maintains said precursor in its colorless form at least until the 1,3-sulfur-nitrogen group undergoes cleavage imagewise to correspond to the imagewise distribution of silver ion and/or soluble silver complex made available as a function of development.
Inventors
- 👤 Howard G. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/12; C07D233/00; C07D233/54; C07D233/56; C07D249/00; C07D249/02; C07D249/08; C07D277/00; C07D277/02; C07D277/04; G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/045; G03C8/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
150 words
A photographic color process which provides a dye image, said process comprising photoexposing a photosensitive element containing a silver halide emulsion, said silver halide emulsion having associated therewith a colorless precursor of a preformed image dye; developing said exposed silver halide emulsion to form an image in developed silver and an imagewise distribution of silver ion and/or soluble silver complex in the partially developed and undeveloped areas of said emulsion; and forming as a function of said development a color image on dye from said colorless precursor, said colorless precursor of a preformed dye being substituted with a moiety comprising a 1,3-sulfur-nitrogen group that maintains said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes cleavage in the presence of said silver ions and/or soluble silver complex formed as a function of development, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
Claim 2
Dependent Claim
150 words
A photographic color process which provides a dye image, said process comprising photoexposing a photosensitive element containing a silver halide emulsion, said silver halide emulsion having associated therewith a colorless precursor of a preformed image dye; developing said exposed silver halide emulsion to form an image in developed silver and an imagewise distribution of silver ion and/or soluble silver complex in the partially developed and undeveloped areas of said emulsion; and forming as a function of said development a color image on dye from said colorless precursor, said colorless precursor of a preformed dye being substituted with a moiety comprising a 1,3-sulfur-nitrogen group that maintains said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes cleavage in the presence of said silver ions and/or soluble silver complex formed as a function of development, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
Claim 3
Dependent Claim
25 words
A process as defined in claim 1 wherein said image dye is substantially non-diffusible from the layer in which it is positioned during said photoexposure.
Claim 4
Dependent Claim
25 words
A process as defined in claim 1 wherein said colorless precursor is substantially non-diffusible from the layer in which it is positioned during said photoexposure.
Claim 5
Dependent Claim
20 words
A process as defined in claim 3 wherein said colorless precursor is positioned in said silver halide emulsion during photoexposure.
Claim 6
Dependent Claim
41 words
A process as defined in claim 1 wherein said image dye provided by said colorless precursor is diffusible, said process including the step of transferring said diffusible image dye to an image-receiving layer in superposed relationship with said silver halide emulsion.
Claim 7
Dependent Claim
51 words
A process as defined in claim 5 wherein a light-reflecting layer is provided between said silver halide emulsion and said image-receiving layer, whereby said dye image may be viewed against said light-reflecting layer, said light-reflecting layer being effective to mask said developed silver halide emulsion from one viewing said dye image.
Claim 8
Dependent Claim
32 words
A process as defined in claim 1 wherein said silver halide emulsion is a negative working silver halide emulsion whereby a positive color image is formed as a function of said development.
Claim 9
Dependent Claim
102 words
A photographic product comprising a photosensitive element comprising a plurality of layers including a support; a silver halide emulsion in a layer on said support; and in a layer on the same side of said support as said silver halide emulsion, a colorless precursor of a preformed image dye substituted with a moiety comprising a 1,3-sulfur-nitrogen group that undergoes cleavage in the presence of silver ions and/or soluble silver complex, said moiety maintaining said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes said cleavage, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
Claim 10
Dependent Claim
102 words
A photographic product comprising a photosensitive element comprising a plurality of layers including a support; a silver halide emulsion in a layer on said support; and in a layer on the same side of said support as said silver halide emulsion, a colorless precursor of a preformed image dye substituted with a moiety comprising a 1,3-sulfur-nitrogen group that undergoes cleavage in the presence of silver ions and/or soluble silver complex, said moiety maintaining said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes said cleavage, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
Claim 11
Dependent Claim
18 words
A photographic product as defined in claim 8 wherein said colorless precursor is non-diffusible in aqueous alkaline solution.
Claim 12
Dependent Claim
23 words
A photographic product as defined in claim 8 wherein said image dye provided by said colorless precursor is non-diffusible in aqueous alkaline solution.
Claim 13
Dependent Claim
47 words
A photographic product as defined in claim 8 wherein said image dye provided by said colorless precursor is diffusable in aqueous alkaline solution and said product includes an image-receiving layer so positioned as to be capable of receiving by diffusion said imagewise distribution of said diffusible dye.
Claim 14
Dependent Claim
34 words
A photographic product as defined in claim 11 which additionally includes means for applying an aqueous processing composition to provide an aqueous alkaline solution of a silver halide developing and a silver halide solvent.
Claim 15
Dependent Claim
57 words
A photographic product as defined in claim 11 which includes a light-reflecting layer between said silver halide emulsion and said image-receiving layer, whereby said dye image formed by said imagewise distribution of diffusible dye may be viewed by reflection, said light-reflecting layer being effective to mask said developed silver halide emulsion from one viewing said dye image.
Claim 16
Dependent Claim
19 words
A photographic product as defined in claim 8 wherein said colorless precursor is positioned in said silver halide emulsion.
Claim 17
Dependent Claim
21 words
A photographic product as defined in claim 8 which includes a silver halide developing agent in said silver halide emulsion layer.
Claim 18
Dependent Claim
29 words
A photographic product as defined in claim 15 which includes a silver halide solvent in a layer on the same side of the support as said silver halide emulsion.
Claim 19
Dependent Claim
18 words
A photographic product as defined in claim 8 wherein said silver halide emulsion is a negative working emulsion.
Claim 20
Dependent Claim
14 words
A photographic product as defined in claim 8 which additionally includes an acid-reacting layer.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |