US4814254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat developable photographic element with conductive layer
Assignee: Fujifilm Holdings Corp
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Filing: 1986-03-07
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Granted: 1989-03-21
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Expires: 2006-03-07
Abstract
Abstract In a photographic element amenable to heat development or mobile dye heat transfer, an electroconductive layer is formed from a composition containing an electroconductive substance, typically carbon black and a high molecular weight compound having a glass transition temperature of not higher than 40° C. at a relative humidity of 20% or a melting point of not higher than 180° C., for example, polyethylene glycol, such that the conductive layer undergoes a minimized change in electric resistance when folded.
Inventors
- 👤 Hideki Naito
- 👤 Hiroyuki Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49872; G03C5/00; G03C5/26; G03C5/263; G03C8/00; G03C8/40; G03C8/4013; G03C8/4046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
A method for forming an image, comprising the steps of: imagewise exposing a photosensitive material comprising a photosensitive silver halide, a binder, and a dye-providing substance capable of forming or releasing a diffusible dye in direct or inverse proportion to reduction of the photosensitive silver halide to silver on a support, and heating the photosensitive material in the presence of water and a base and/or a base precursor during or after the imagewise exposure by conducting electricity to an electroconductive layer which is formed on the support of the photosensitive material or on a support of a dye-fixing material combined with the photosensitive material, said electroconductive layer containing at least an electroconductive substance and a polymeric compound having a glass transition temperature of up to 40° C. at a relative humidity of 20% or a melting point of up to 180° C., said electroconductive layer having a volume resistance of from 0.01 to 10 Ω-cm, thereby transferring the diffusible dye thus formed or released to a dye-fixing layer to form an image.
Claim 2
Independent Claim
172 words
A method for forming an image, comprising the steps of: imagewise exposing a photosensitive material comprising a photosensitive silver halide, a binder, and a dye-providing substance capable of forming or releasing a diffusible dye in direct or inverse proportion to reduction of the photosensitive silver halide to silver on a support, and heating the photosensitive material in the presence of water and a base and/or a base precursor during or after the imagewise exposure by conducting electricity to an electroconductive layer which is formed on the support of the photosensitive material or on a support of a dye-fixing material combined with the photosensitive material, said electroconductive layer containing at least an electroconductive substance and a polymeric compound having a glass transition temperature of up to 40° C. at a relative humidity of 20% or a melting point of up to 180° C., said electroconductive layer having a volume resistance of from 0.01 to 10 Ω-cm, thereby transferring the diffusible dye thus formed or released to a dye-fixing layer to form an image.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein the electroconductive layer is comprised of the electroconductive substance and a binder containing the high molecular weight compound having a glass transition temperature of up to 40° C. at a relative humidity of 20% or a melting point of up to 180° C.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the electroconductive substance is present in an amount of 10 to 90% by weight of the electroconductive layer.
Claim 5
Dependent Claim
45 words
The method of claim 2 wherein the binder contains at least 1% by weight of the high molecular weight compound having a glass transition temperature of up to 40° C. at a relative humidity of 20% or a melting point of up to 180° C.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the electroconductive layer has a thickness of 0.5 to 15 μm.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the photosensitive layer is heat developable.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the electroconductive substance is carbon black.
Claim 9
Dependent Claim
27 words
The method of claim 7 wherein the carbon black has a dibutyl phthalate (DBP) oil absorption of more than 80 cc/100 grams as measured by JIS K6221.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |