Patent US4220709A successfully refreshed from Google Patents.
US4220709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat developable imaging materials and process
Assignee: Eastman Kodak Co
•
Filing: 1977-12-08
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Granted: 1980-09-02
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Expires: 1997-12-08
Abstract
Abstract A heat developable photographic material comprising in reactive association (a) photosensitive silver halide, (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids or combinations thereof, with (ii) an organic reducing agent, and (c) a polymeric binder, provide developed images without the need for processing solutions or baths. An image can be developed in this heat developable material by merely heating the material to moderately elevated temperatures. Other addenda employed in heat developable materials can be employed with the heat developable photographic materials described.
Inventors
- 👤 Richard A. DEMauriac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49809
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
73 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
Claim 2
Dependent Claim
73 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
Claim 3
Dependent Claim
20 words
A heat-developable, photographic element as in claim 1 wherein said photosensitive silver halide is a gelatino photographic silver halide emulsion.
Claim 4
Dependent Claim
36 words
A heat-developable, photographic element as in claim 1 wherein said organic reducing agent is selected from the group consisting of hydroquinone, ascorbic acid, pyrogallol, gallic acid ester, and phenylenediamine silver halide developing agents and combinations thereof.
Claim 5
Dependent Claim
16 words
A heat-developable, photographic element as in claim 1 wherein said polymeric binder is a gelatino binder.
Claim 6
Dependent Claim
13 words
A heat-developable, photographic element as in claim 1 also comprising a toning agent.
Claim 7
Dependent Claim
26 words
A heat-developable, photographic element as in claim 1 also comprising a toning agent selected from the group consisting of 1,2,4-triazole, 1H-tetrazole, thiouracil and 1,3,4-thiadiazole toning agents.
Claim 8
Dependent Claim
14 words
A heat-developable, photographic element as in claim 1 also comprising a 5-amino-1,3,4-thiadiazole-2-thiol toning agent.
Claim 9
Dependent Claim
14 words
A heat-developable, photographic element as in claim 1 also comprising a 3-mercapto-1,2,4-triazole toning agent.
Claim 10
Dependent Claim
15 words
A heat-developable, photographic element as in claim 1 also comprising a bis(dimethylthiocarbamyl) disulfide toning agent.
Claim 11
Dependent Claim
14 words
A heat-developable, photographic element as in claim 1 also comprising a separate melt-forming compound.
Claim 12
Dependent Claim
18 words
A heat-developable, photographic element as in claim 1 also comprising a separate melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 13
Dependent Claim
31 words
A heat-developable, photographic element as in claim 1 also comprising a spectral sensitizing dye selected from the group consisting of anionic cyanine dyes, anionic merocyanine dyes and combinations of said dyes.
Claim 14
Dependent Claim
34 words
A heat-developable, photographic element as in claim 1 comprising for each mole of said photographic silver halide, 5 to 20 moles of said complex and 3 to 15 moles of said organic reducing agent.
Claim 15
Dependent Claim
44 words
A heat-developable, photographic element as in claim 1 wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1 and pAg in said element is within the range of 2 to 6.
Claim 16
Dependent Claim
69 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association: (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
Claim 17
Dependent Claim
69 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association: (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
Claim 18
Dependent Claim
20 words
A heat-developable, photographic composition as in claim 15 wherein said photosensitive silver halide is a gelatino photographic silver halide emulsion.
Claim 19
Dependent Claim
36 words
A heat-developable, photographic composition as in claim 15 wherein said organic reducing agent is selected from the group consisting of hydroquinone, ascorbic acid, pyrogallol, gallic acid esters, and phenylenediamine silver halide developing agents, and combinations thereof.
Claim 20
Dependent Claim
16 words
A heat-developable, photographic composition as in claim 15 wherein said polymeric binder is a gelatino binder.
Claim 21
Dependent Claim
13 words
A heat-developable, photographic composition as in claim 15 also comprising a toning agent.
Claim 22
Dependent Claim
26 words
A heat-developable, photographic composition as in claim 15 also comprising a toning agent selected from the group consisting of 1,2,4-triazole, 1H-tetrazole, thiouracil and 1,3,4-thiadiazole toning agents.
Claim 23
Dependent Claim
14 words
A heat-developable, photographic composition as in claim 15 also comprising a 5-amino-1,3,4-thiadiazole-2-thiol toning agent.
Claim 24
Dependent Claim
14 words
A heat-developable, photographic composition as in claim 15 also comprising a 3-mercapto-1,2,4-triazole toning agent.
Claim 25
Dependent Claim
15 words
A heat-developable, photographic composition as in claim 15 also comprising a bis(dimethylthiocarbamyl) disulfide toning agent.
Claim 26
Dependent Claim
14 words
A heat-developable, photographic composition as in claim 15 also comprising a separate melt-forming compound.
Claim 27
Dependent Claim
16 words
A heat-developable, photographic composition as in claim 15 also comprising 1,3-dimethylurea at a separate melt-forming compound.
Claim 28
Dependent Claim
31 words
A heat-developable, photographic composition as in claim 15 also comprising a spectral sensitizing dye selected from the group consisting of anionic cyanine dyes, anionic merocyanine dyes, and combinations of said dyes.
Claim 29
Dependent Claim
34 words
A heat-developable, photographic composition as in claim 15 comprising for each mole of said photographic silver halide, 5 to 20 moles of said complex and 3 to 15 moles of said organic reducing agent.
Claim 30
Dependent Claim
90 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) photosensitive silver halide, (b) an image forming combination comprising (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acid and combinations thereof with (ii) an organic reducing agent, and (c) a polymeric binder, comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed.
Claim 31
Dependent Claim
90 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) photosensitive silver halide, (b) an image forming combination comprising (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acid and combinations thereof with (ii) an organic reducing agent, and (c) a polymeric binder, comprising heating said element to a temperature within the range of about 120° C. to about 180° C. until said image is developed.
Claim 32
Dependent Claim
31 words
A process as in claim 28 comprising heating said element to a temperature within the range of about 120° C. to about 180° C. for about 1 to about 30 seconds.
Claim 33
Dependent Claim
53 words
A process as in claim 28 wherein said complex of silver with a nitrogen acid is represented by the formula ##STR8## wherein R is hydrogen or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 34
Dependent Claim
61 words
A process as in claim 28 wherein said complex of silver with a nitrogen acid is represented by the formula ##STR9## wherein R 1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 35
Dependent Claim
92 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR10## wherein R is hydrogen or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 36
Dependent Claim
92 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR10## wherein R is hydrogen or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 37
Dependent Claim
100 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR11## wherein R 1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 38
Dependent Claim
100 words
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR11## wherein R 1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 39
Dependent Claim
88 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR12## wherein R is hydrogen or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 40
Dependent Claim
88 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR12## wherein R is hydrogen or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 41
Dependent Claim
96 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR13## wherein R 1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 42
Dependent Claim
96 words
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association (a) photosensitive silver halide, and (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent, the improvement wherein said complex of silver with a nitrogen acid is represented by the formula: ##STR13## wherein R 1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH 2 ; and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
Claim 43
Dependent Claim
91 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a silver salt of dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-diol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea, comprising heating said element to a temperature within the range of about 140° C. to about 165° C. until said image is developed.
Claim 44
Dependent Claim
91 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a silver salt of dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-diol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea, comprising heating said element to a temperature within the range of about 140° C. to about 165° C. until said image is developed.
Claim 45
Dependent Claim
91 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea, comprising heating said element to a temperature within the range of about 140° C. to about 165° C. until said image is developed.
Claim 46
Dependent Claim
91 words
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea, comprising heating said element to a temperature within the range of about 140° C. to about 165° C. until said image is developed.
Claim 47
Dependent Claim
62 words
A heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image forming combination comprising (i) a complex of silver with dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 48
Dependent Claim
62 words
A heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image forming combination comprising (i) a complex of silver with dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 49
Dependent Claim
61 words
A heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto 1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 50
Dependent Claim
61 words
A heat-developable, photographic element comprising a support having thereon in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto 1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 51
Dependent Claim
58 words
A heat-developable, photographic composition comprising in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image forming combination comprising (i) a complex of silver with dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 52
Dependent Claim
58 words
A heat-developable, photographic composition comprising in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image forming combination comprising (i) a complex of silver with dodecyltetrazole, and (ii) an ascorbic acid developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 53
Dependent Claim
56 words
A heat-developable, photographic composition comprising in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Claim 54
Dependent Claim
56 words
A heat-developable, photographic composition comprising in reactive association (a) a gelatino photosensitive silver halide emulsion, (b) an image-forming combination comprising (i) a complex of silver with 3-amino-1,2,4-triazole, and (ii) a hydroquinone developing agent, (c) a gelatino binder, (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
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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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |