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US4435499A
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Photothermographic silver halide material and process
Assignee: Eastman Kodak Co
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Filing: 1983-01-31
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Granted: 1984-03-06
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Expires: 2003-01-31
Abstract
Abstract Photosensitive silver halide grains that are thin tabular grains having an average grain thickness of less than 0.3 microns provide advantages, including improved spectral sensitization and image tone, in a photothermographic material comprising photosensitive silver halide and a photosensitive silver halide processing agent. An image is developed in such an exposed photothermographic material by heating the material, such as to a temperature within the range of about 90 DEG C. to about 180 DEG C.
Inventors
- 👤 John W. Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:05
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49818; G03C1/005; G03C1/0051; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 58
Claim 1
Independent Claim
54 words
In a photothermographic element comprising a support bearing in reactive association, photosensitive silver halide grains and a photosensitive silver halide processing agent, the improvement wherein; at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 2
Dependent Claim
54 words
In a photothermographic element comprising a support bearing in reactive association, photosensitive silver halide grains and a photosensitive silver halide processing agent, the improvement wherein; at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 3
Dependent Claim
32 words
A photothermographic element as in claim 1 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns.
Claim 4
Dependent Claim
44 words
A photothermographic element as in claim 1 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 5
Dependent Claim
62 words
A photothermographic element as in claim 1 wherein at least 70% of said photosensitive silver halide grains are thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.345 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 6
Dependent Claim
19 words
A photothermographic element as in claim 1 wherein said photosensitive silver halide is a silver bromoiodide or silver halide.
Claim 7
Dependent Claim
15 words
A photothermographic element as in claim 1 wherein said thin tabular grains are spectrally sensitized.
Claim 8
Dependent Claim
23 words
A photothermographic element as in claim 1 wherein said thin tabular grains are spectrally sensitized to the red region of the electromagnetic spectrum.
Claim 9
Dependent Claim
14 words
A photothermographic element as in claim 1 comprising a gelatino photographic silver halide emulsion.
Claim 10
Dependent Claim
10 words
A photothermographic element as in claim 1 comprising a binder.
Claim 11
Dependent Claim
12 words
A photothermographic element as in claim 1 comprising a poly(vinyl butyral) binder.
Claim 12
Dependent Claim
20 words
A photothermographic element as in claim 1 wherein said photographic silver halide processing agent comprises a silver halide developing agent.
Claim 13
Dependent Claim
76 words
In a photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, the improvement wherein; at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 14
Dependent Claim
76 words
In a photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, the improvement wherein; at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 15
Dependent Claim
31 words
A photothermographic element as in claim 12 wherein said photosensitive silver halide grains are thin tabular grains having an average thickness within the range of about 0.03 to about 0.08 microns.
Claim 16
Dependent Claim
43 words
A photothermographic element as in claim 12 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns and an aspect ratio within the range of 5:1 and 15:1.
Claim 17
Dependent Claim
62 words
A photothermographic element as in claim 12 wherein at least 70% of said photosensitive silver halide grains are thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 18
Dependent Claim
19 words
A photothermographic element as in claim 12 wherein said photosensitive silver halide is a silver bromoiodide or silver bromide.
Claim 19
Dependent Claim
15 words
A photothermographic element as in claim 12 wherein said thin tabular grains are spectrally sensitized.
Claim 20
Dependent Claim
23 words
A photothermographic element as in claim 12 wherein said thin tabular grains are spectrally sensitized to the red region of the electromagnetic spectrum.
Claim 21
Dependent Claim
14 words
A photothermographic element as in claim 12 comprising a gelatino photographic silver halide emulsion.
Claim 22
Dependent Claim
54 words
A photothermographic element as in claim 12 wherein said image forming combination comprises (i) an organic heavy metal salt oxidizing agent which is a silver salt of a long chain fatty acid with (ii) a reducing agent for the organic heavy metal salt oxidizing agent wherein the reducing agent comprises a phenolic reducing agent.
Claim 23
Dependent Claim
10 words
A photothermographic element as in claim 12 comprising a binder.
Claim 24
Dependent Claim
12 words
A photothermographic element as in claim 12 comprising a poly(vinyl butyral) binder.
Claim 25
Dependent Claim
114 words
In a photothermographic element comprising a support bearing, in reactive association, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains and (b) and image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, the improvement wherein; at least 70% of the projected area of the photographic silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 26
Dependent Claim
114 words
In a photothermographic element comprising a support bearing, in reactive association, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains and (b) and image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, the improvement wherein; at least 70% of the projected area of the photographic silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 27
Dependent Claim
48 words
In a photothermographic composition comprising photosensitive silver halide grains and a photographic silver halide processing agent, the improvement wherein, at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 28
Dependent Claim
48 words
In a photothermographic composition comprising photosensitive silver halide grains and a photographic silver halide processing agent, the improvement wherein, at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 29
Dependent Claim
32 words
A photothermographic composition as in claim 24 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns.
Claim 30
Dependent Claim
44 words
A photothermographic composition as in claim 24 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 31
Dependent Claim
68 words
A photothermographic composition as in claim 24 wherein at least 70% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 32
Dependent Claim
19 words
A photothermographic composition as in claim 24 wherein said photosensitive silver halide is a silver bromoiodide or silver bromide.
Claim 33
Dependent Claim
15 words
A photothermographic composition as in claim 24 wherein said thin tabular grains are spectrally sensitized.
Claim 34
Dependent Claim
23 words
A photothermographic composition as in claim 24 wherein said thin tabular grains are spectrally sensitized to the red region of the electromagnetic spectrum.
Claim 35
Dependent Claim
14 words
A photothermographic composition as in claim 24 comprising a gelatino photographic silver halide emulsion.
Claim 36
Dependent Claim
10 words
A photothermographic composition as in claim 24 comprising a binder.
Claim 37
Dependent Claim
12 words
A photothermographic composition as in claim 24 comprising a ply(vinyl butyral) binder.
Claim 38
Dependent Claim
20 words
A photothermographic composition as in claim 24 wherein said photographic silver halide processing agent comprises a silver halide developing agent.
Claim 39
Dependent Claim
70 words
In a photothermographic composition comprising (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, the improvement wherein; at least 50% of the projected area of the phototsensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 40
Dependent Claim
70 words
In a photothermographic composition comprising (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, the improvement wherein; at least 50% of the projected area of the phototsensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns.
Claim 41
Dependent Claim
32 words
A photothermographic composition as in claim 35 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns.
Claim 42
Dependent Claim
44 words
A photothermographic composition as in claim 35 wherein said photosensitive silver halide grains are thin tabular grains having an average grain thickness within the range of about 0.03 to about 0.08 microns and an average aspect ratio within the range of 5:1 to 15:1.
Claim 43
Dependent Claim
67 words
A photothermographic composition as in claim 35 wherein at least 70% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average thickness within the range of about 0.04 to about 0.05 micron and an average aspect ratio within the range of 5:1 to 15:1.
Claim 44
Dependent Claim
19 words
A photothermographic composition as in claim 35 wherein said photosensitive silver halide is a silver bromoiodide or silver bromide.
Claim 45
Dependent Claim
15 words
A photothermographic composition as in claim 35 wherein said thin tabular grains are spectrally sensitized.
Claim 46
Dependent Claim
23 words
A photothermographic composition as in claim 35 wherein said thin tabular grains are spectrally sensitized to the red region of the electromagnetic spectrum.
Claim 47
Dependent Claim
14 words
A photothermographic composition as in claim 35 comprising a gelatino photographic silver halide emulsion.
Claim 48
Dependent Claim
54 words
A photothermographic composition as in claim 35 wherein said image forming combination comprises (i) an organic heavy metal salt oxidizing agent which is a silver salt of a long chain fatty acid with (ii) a reducing agent for the organic heavy metal salt oxidizing agent wherein the reducing agent comprises a phenolic reducing agent.
Claim 49
Dependent Claim
11 words
A photothermographic composition as in claim 35 also comprising a binder.
Claim 50
Dependent Claim
13 words
A photothermographic composition as in claim 35 also comprising a poly(vinyl butyral) binder.
Claim 51
Dependent Claim
107 words
In a photothermographic composition comprising, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, the improvement wherein, at least 70% of the projected area of the photographic silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an aspect ratio within the range of 5:1 to 15:1.
Claim 52
Dependent Claim
107 words
In a photothermographic composition comprising, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains and (b) an image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, the improvement wherein, at least 70% of the projected area of the photographic silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an aspect ratio within the range of 5:1 to 15:1.
Claim 53
Dependent Claim
86 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains wherein at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns, and (b) a photosensitive silver halide processing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
Claim 54
Dependent Claim
86 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains wherein at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns, and (b) a photosensitive silver halide processing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
Claim 55
Dependent Claim
106 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains wherein at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns, and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
Claim 56
Dependent Claim
106 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, (a) photosensitive silver halide grains wherein at least 50% of the projected area of the photosensitive silver halide grains is provided by thin tabular grains having an average grain thickness of less than 0.3 microns, and (b) an image forming combination comprising (i) an organic heavy metal salt oxidizing agent with (ii) a reducing agent for the organic heavy metal salt oxidizing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
Claim 57
Dependent Claim
143 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains wherein at least 70% of the projected area of the silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1; and (b) an image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
Claim 58
Dependent Claim
143 words
A process of developing an image in an exposed photothermographic element comprising a support bearing, in reactive association, in a poly(vinyl butyral) binder, (a) photosensitive silver halide grains wherein at least 70% of the projected area of the silver halide grains is provided by thin tabular grains having an average grain diameter within the range of about 0.30 to about 0.45 μm, an average grain thickness within the range of about 0.04 to about 0.05 microns and an average aspect ratio within the range of 5:1 to 15:1; and (b) an image forming combination comprising (i) an organic silver salt oxidizing agent comprising silver behenate with (ii) a phenolic reducing agent for the organic silver salt oxidizing agent, said process comprising; heating said element to a temperature within the range of about 90° C. to about 180° C. until said image is developed.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |