US3932189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermodevelopable photographic material containing high silver ion conducting substance
Assignee: Fujifilm Holdings Corp
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Filing: 1974-01-10
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Granted: 1976-01-13
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Expires: 1994-01-10
Abstract
Abstract A thermodevelopable photographic material comprising a support and a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25°C of at least 1 × 10 - 3 (Ωcm) - 1 , such as silver iodide tungstate, or a mixture of the high silver ion conducting substance with silver, and (b) a weak reducing agent. In order to increase the sensitivity of the material, a photosensitive silver halide can further be incorporated in the layer. The photographic material is exposed imagewise, and then heated for a short time to form a permanent visible image of clear contrast.
Inventors
- 👤 Takuji Kaneda
- 👤 Makoto Nagao
- 👤 Satoru Honjo
- 👤 Eiichi Mizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A thermodevelopable photographic material comprising a support having thereon a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25°C of at least 1 × 10 - 3 (Ω cm) - 1 or a mixture of said high silver ion conducting substance with silver, and (b) a weak reducing agent, said high silver ion conducting substance being selected from the group consisting of silver iodide phosphate, silver iodide tungstate, a double salt of silver iodide and a tetra alkylammonium iodide, and a double salt of silver iodide and a polymethonium iodide.
Claim 2
Dependent Claim
97 words
A thermodevelopable photographic material comprising a support having thereon a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25°C of at least 1 × 10 - 3 (Ω cm) - 1 or a mixture of said high silver ion conducting substance with silver, and (b) a weak reducing agent, said high silver ion conducting substance being selected from the group consisting of silver iodide phosphate, silver iodide tungstate, a double salt of silver iodide and a tetra alkylammonium iodide, and a double salt of silver iodide and a polymethonium iodide.
Claim 3
Dependent Claim
116 words
A thermodevelopable photographic material comprising a support and a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25°C of at least 1 × 10 - 3 (Ω cm) - 1 or a mixture of said high silver ion conducting substance with silver, (b) a weak reducing agent, and (c) a photosensitive silver halide or a compound capable of forming a photosensitive silver halide by reaction with the component (a), said high silver ion conducting substance being selected from the group consisting of silver iodide phosphate, silver iodide tungstate, a double salt of silver iodide and a tetraalkylammonium iodide, and a double salt of silver iodide and a polymethonium iodide.
Claim 4
Dependent Claim
116 words
A thermodevelopable photographic material comprising a support and a layer composed of (a) a high silver ion conducting substance having an ion conductivity at 25°C of at least 1 × 10 - 3 (Ω cm) - 1 or a mixture of said high silver ion conducting substance with silver, (b) a weak reducing agent, and (c) a photosensitive silver halide or a compound capable of forming a photosensitive silver halide by reaction with the component (a), said high silver ion conducting substance being selected from the group consisting of silver iodide phosphate, silver iodide tungstate, a double salt of silver iodide and a tetraalkylammonium iodide, and a double salt of silver iodide and a polymethonium iodide.
Claim 5
Dependent Claim
35 words
The photographic material of claim 1, wherein the amount of said silver with said silver ion conductive substance is 0.002 to 0.1 part by weight per part by weight of said silver ion conducting substance.
Claim 6
Dependent Claim
51 words
The photographic material of claim 1, wherein said weak reducing agent is selected from the group consisting of substituted phenols, substituted or unsubstituted bisphenols, substituted or unsubstituted naphthols, di- and poly-hydroxybenzenes, di- and poly-hydroxynaphthalenes, hydroquinone monoethers, ascorbic acid and its derivatives, 3-pyrazolidones, pyrazoline-5-ones, reducing saccharides, kojic acid, hinokitiol, and thiourazole derivatives.
Claim 7
Dependent Claim
14 words
The photographic material of claim 1, wherein said layer further contains a white pigment.
Claim 8
Dependent Claim
30 words
The photographic material of claim 1, wherein the amount of said weak reducing agent (b) is 0.002 to 0.5 part by weight per part of said silver ion conducting substance.
Claim 9
Dependent Claim
30 words
The photographic material of Claim 2, wherein the amount of said component (c) is 0.0002 to 0.01 part by weight per part by weight of said silver ion conducting substance.
Claim 10
Dependent Claim
34 words
The photographic material of claim 2, wherein the amount of said silver with said silver ion conducting substance is 0.002 to 0.1 part by weight per part by weight of said silver conducting substance.
Claim 11
Dependent Claim
51 words
The photographic material of claim 2, wherein said weak reducing agent is selected from the group consisting of substituted phenols, substituted or unsubstituted bisphenols, substituted or unsubstituted naphthols, di- and poly-hydroxybenzenes, di- and poly-hydroxynaphthalenes, hydroquinone monoethers, ascorbic acid and its derivatives, 3-pyrazolidones, pyrazoline-5-ones, reducing saccharides, kojic acid, hinokitiol, and thiourazole derivatives.
Claim 12
Dependent Claim
14 words
The photographic material of claim 2, wherein said layer further contains a white pigment.
Claim 13
Dependent Claim
30 words
The photographic material of claim 2, wherein the amount of said weak reducing agent (b) is 0.002 to 0.5 part by weight per part of said silver ion conducting substance.
References Cited (Backward Citations)
US3457075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |