US4347301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel diffusion transfer film units
Assignee: Polaroid Corp
•
Filing: 1980-11-26
•
Granted: 1982-08-31
•
Expires: 2000-11-26
Abstract
Abstract The present invention is directed to photosensitive elements and to diffusion transfer film units employing said elements wherein said photosensitive element includes a plurality of essential layers, including a first photosensitive silver halide layer and a second photosensitive silver halide layer, said first and second silver halide layers being sensitized to substantially the same spectral absorption range; a spacer layer intermediate and contiguous to said first and second silver halide layers, said spacer layer consisting essentially of inert particles which are substantially non-swelling in alkali, and substantially non-film forming; wherein said inert particles are equal to or less than the average diameter of the silver halide grains in said first and second silver halide layers and wherein said silver halide grains are 2.5 microns or less in average diameter; said first and second silver halide layers having associated therewith a dye image-forming material which is diffusible during processing as a function of the point-to-point degree of silver halide exposure to actinic radiation.
Inventors
- 👤 Peter O. Kliem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
138 words
A photosensitive element for use in a diffusion transfer film unit which comprises a support carrying; (a) a first silver halide emulsion layer (b) a second silver halide emulsion layer; said first and second silver halide emulsion layers being sensitive to substantially the same spectral absorption range and having associated therewith a material which provides a dye image-forming material which is diffusible during processing as a function of the point-to-point degree of silver halide exposure to actinic radiation; (c) a spacer layer intermediate and contiguous to said first and second silver halide emulsion layers; said spacer layer consisting essentially of inert particles which are substantially non-swelling in alkali and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 2
Dependent Claim
138 words
A photosensitive element for use in a diffusion transfer film unit which comprises a support carrying; (a) a first silver halide emulsion layer (b) a second silver halide emulsion layer; said first and second silver halide emulsion layers being sensitive to substantially the same spectral absorption range and having associated therewith a material which provides a dye image-forming material which is diffusible during processing as a function of the point-to-point degree of silver halide exposure to actinic radiation; (c) a spacer layer intermediate and contiguous to said first and second silver halide emulsion layers; said spacer layer consisting essentially of inert particles which are substantially non-swelling in alkali and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 3
Dependent Claim
14 words
The element of claim 1 wherein said particles are derived from a polymeric latex.
Claim 4
Dependent Claim
10 words
The element of claim 2 wherein said polymer is polymethylmethacrylate.
Claim 5
Dependent Claim
10 words
The element of claim 2 wherein said polymer is polystyrene.
Claim 6
Dependent Claim
20 words
The element of claim 1 wherein said spacer includes a polymer binder adapted to promote integrity of said spacer layer.
Claim 7
Dependent Claim
11 words
The element of claim 5 wherein said polymer binder is polyacrylamide.
Claim 8
Dependent Claim
35 words
The element of claim 1 wherein said first silver halide emulsion layer comprises grain of a first mean particle size and said second silver halide emulsion layer contains grains of a second mean particle size.
Claim 9
Dependent Claim
19 words
The element of claim 1 wherein said first and second silver halide layers are free of dye image-forming material.
Claim 10
Dependent Claim
25 words
The element of claim 1 wherein the thickness of said spacer layer is 0.5 to 10 times (weight basis) as the individual silver halide layers.
Claim 11
Dependent Claim
20 words
The element of claim 9 wherein said spacer layer is 4 times (weight basis) as the individual silver halide layer.
Claim 12
Dependent Claim
21 words
The element of claim 10 wherein there is a difference in speed between said first and second silver halide emulsion layers.
Claim 13
Dependent Claim
25 words
The element of claim 1 wherein the speed difference between said first and second silver halide layers ranges from about 2 to about 8 stops.
Claim 14
Dependent Claim
13 words
The element of claim 12 wherein said speed difference is about 5 stops.
Claim 15
Dependent Claim
15 words
The element of claim 1 wherein said dye image forming material is a dye developer.
Claim 16
Dependent Claim
156 words
A photographic diffusion transfer film unit comprising a support carrying at least one photosensitive element comprising a first and second photosensitive silver halide layer and a dyeable receiving layer adapted to receive a dye image diffusing thereto after photoexposure and processing of said photosensitive element; said first and second silver halide layers being sensitive to substantially the same spectral absorption region; said first and second photosensitive silver halide layers having associated therewith a material which provides a dye image forming material which is diffusible during processing as a function of the point-to-point degree of silver haide exposure to actinic radiation; and, intermediate and contiguous to said first and second photosensitive silver halide layers, a spacer layer consisting essentially of particles which are substantially non-swelling in alkali, and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 17
Dependent Claim
156 words
A photographic diffusion transfer film unit comprising a support carrying at least one photosensitive element comprising a first and second photosensitive silver halide layer and a dyeable receiving layer adapted to receive a dye image diffusing thereto after photoexposure and processing of said photosensitive element; said first and second silver halide layers being sensitive to substantially the same spectral absorption region; said first and second photosensitive silver halide layers having associated therewith a material which provides a dye image forming material which is diffusible during processing as a function of the point-to-point degree of silver haide exposure to actinic radiation; and, intermediate and contiguous to said first and second photosensitive silver halide layers, a spacer layer consisting essentially of particles which are substantially non-swelling in alkali, and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 18
Dependent Claim
16 words
The film unit of claim 15 wherein said unit particles are derived from a polymer latex.
Claim 19
Dependent Claim
11 words
The film unit of claim 15 wherein said polymer is polymethylmethacrylate.
Claim 20
Dependent Claim
11 words
The film unit of claim 15 wherein said polymer is polystyrene.
Claim 21
Dependent Claim
21 words
The film unit of claim 15 wherein said spacer includes a polymer binder adapted to promote integrity to said spacer layer.
Claim 22
Dependent Claim
12 words
The film unit of claim 19 wherein said second polymer is polyacrylamide.
Claim 23
Dependent Claim
21 words
The film unit of claim 15 wherein said first and second silver halide layers are free of dye image forming material.
Claim 24
Dependent Claim
26 words
The film unit of claim 15 wherein the thickness of said spacer layer is 0.5 to 10 times (weight basis) as the individual silver halide layers.
Claim 25
Dependent Claim
21 words
The film unit of claim 22 wherein said spacer layer is 4 times (weight basis) as the individual silver halide layer.
Claim 26
Dependent Claim
36 words
The film unit of claim 15 wherein said first silver halide emulsion layer comprises grains of a first mean particle size and said second silver halide emulsion layer possesses grains of a second mean particle size.
Claim 27
Dependent Claim
22 words
The film unit of claim 15 wherein there is a difference in speed between said first and second silver halide emulsion layers.
Claim 28
Dependent Claim
26 words
The film unit of claim 25 wherein the speed difference between said first and second silver halide layers ranges from about 2 to about 8 stops.
Claim 29
Dependent Claim
14 words
The film unit of claim 26 wherein said speed difference is about 5 stops.
Claim 30
Dependent Claim
16 words
The film unit of claim 15 wherein said dye image forming material is a dye developer.
Claim 31
Dependent Claim
25 words
The film unit of claim 15 which includes a rupturable container of processing composition adapted to discharge its contents between a predetermined pair of layers.
Claim 32
Dependent Claim
33 words
The film unit of claim 29 wherein said dyeable receiving layer is adapted to be superposed over the silver halide emulsion layer subsequent to photoexposure and adapted to be separated therefrom after processing.
Claim 33
Dependent Claim
30 words
The film unit of claim 30 which provides a permanent laminate wherein the image is viewable in said receiving layer without separation of said receiving layer from said film unit.
Claim 34
Dependent Claim
173 words
A photographic film unit which comprises, in combination: a photosensitive element having a diffusion transfer image-receiving element affixed to at least one edge thereof is superposed or superposable relationship, said photosensitive element comprising a support carrying: (a) a red-sensitive silver halide unit having associated therewith a cyan dye developer; (b) a green-sensitive silver halide unit having associated therewith a magenta dye developer; (c) a blue-sensitive silver halide unit having associated therewith a yellow dye developer; wherein at least one of said silver halide units comprises, (1) a first silver halide emulsion layer and (2) a second silver halide emulsion layer; sad first and second photosensitive silver halide layers being sensitive to substantially the same spectral absorption range, a spacer layer intermediate and contiguous to photosensitive silver halide layers, said spacer layer consisting essentially of polymer latex particles which are substantially non-swelling in alkali, and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 35
Dependent Claim
173 words
A photographic film unit which comprises, in combination: a photosensitive element having a diffusion transfer image-receiving element affixed to at least one edge thereof is superposed or superposable relationship, said photosensitive element comprising a support carrying: (a) a red-sensitive silver halide unit having associated therewith a cyan dye developer; (b) a green-sensitive silver halide unit having associated therewith a magenta dye developer; (c) a blue-sensitive silver halide unit having associated therewith a yellow dye developer; wherein at least one of said silver halide units comprises, (1) a first silver halide emulsion layer and (2) a second silver halide emulsion layer; sad first and second photosensitive silver halide layers being sensitive to substantially the same spectral absorption range, a spacer layer intermediate and contiguous to photosensitive silver halide layers, said spacer layer consisting essentially of polymer latex particles which are substantially non-swelling in alkali, and substantially non-film forming; said particles being less than or equal to the silver halide grains in average diameter; said silver halide grains being 2.5μ or less in average diameter.
Claim 36
Dependent Claim
29 words
The film unit of claim 32 including a rupturable container retaining an aqueous alkaline processing composition and adapted to discharge its contents intermediate said superposed photosensitive and image-receiving elements.
Claim 37
Dependent Claim
16 words
The film unit of claim 32 wherein the support layer of said image-receiving element is transparent.
Claim 38
Dependent Claim
39 words
The film unit of claim 34 in which said unit is a composite structure comprising said photosensitive element and said image-receiving element affixed to the other in superposed relationship, the support layers of each of said elements being outermost.
Claim 39
Dependent Claim
11 words
The film unit of claim 32 wherein said polymer is polymethylmethacrylate.
Claim 40
Dependent Claim
11 words
The film unit of claim 32 wherein said polymer is polystyrene.
Claim 41
Dependent Claim
21 words
The film unit of claim 32 wherein said spacer includes a polymer binder adapted to promote integrity to said spacer layer.
Claim 42
Dependent Claim
11 words
The film unit of claim 38 wherein said polymer is polyacrylamide.
Claim 43
Dependent Claim
19 words
The film unit of claim 32 wherein said first and second silver halide layers are free of dye developer.
Claim 44
Dependent Claim
26 words
The film unit of claim 32 wherein the thickness of said spacer layer is 0.5 to 10 times (weight basis) as the individual silver halide layers.
Claim 45
Dependent Claim
21 words
The film unit of claim 41 wherein said spacer layer is 4 times (weight basis) as the individual silver halide layer.
Claim 46
Dependent Claim
27 words
The film unit of claim 32 wherein there is a speed difference between said first and second photosensitive silver halide layers of about 2 to 8 stops.
Claim 47
Dependent Claim
14 words
The film unit of claim 43 wherein said speed difference is about 5 stops.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |