Patent US4187424A successfully refreshed from Google Patents.
US4187424A
Expired / Lapsed
US
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Radioelectrophotography process
Assignee: Fujifilm Holdings Corp
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Filing: 1977-05-18
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Granted: 1980-02-05
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Expires: 1997-05-18
Abstract
Abstract A process for radioelectrophotography, which comprises imparting a uniform electrostatic charge to the surface of a recording layer of an image-recording material and containing dispersed therein many cells and/or pores to cause a strong electric charge to act on the gas inside the cells and/or pores, and irradiating the recording layer with radiation carrying image information to imagewise remove the charge on the surface of the recording layer and form an electrostatic latent image.
Inventors
- 👤 Eiichi Inoue
- 👤 Takashi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:31
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0503; G03G5/0507
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A process for radioelectrophotography, which comprises imparting a uniform electrostatic charge to the surface of a recording layer of an image-recording material containing dispersed therein many cells and/or pores with gas sealed therein so as to cause a sufficiently strong electric charge to act on the gas inside said cells and/or pores to substantially ionize said gas, and irradiating said recording layer with penetrating radiation carrying image information to imagewise remove the charge on the surface of said recording layer and form an electrostatic latent image, wherein the gas is selected from the group consisting of air, nitrogen, a halogen, oxygen, carbon dioxide, carbon monoxide, a rare gas, and mixtures thereof the size of said cells in said recording layer ranges from about 0.0025 mμ to about 100 mμ and the degree of porosity of said recording layer ranges from about 27 to about 85 volume %.
Claim 2
Dependent Claim
147 words
A process for radioelectrophotography, which comprises imparting a uniform electrostatic charge to the surface of a recording layer of an image-recording material containing dispersed therein many cells and/or pores with gas sealed therein so as to cause a sufficiently strong electric charge to act on the gas inside said cells and/or pores to substantially ionize said gas, and irradiating said recording layer with penetrating radiation carrying image information to imagewise remove the charge on the surface of said recording layer and form an electrostatic latent image, wherein the gas is selected from the group consisting of air, nitrogen, a halogen, oxygen, carbon dioxide, carbon monoxide, a rare gas, and mixtures thereof the size of said cells in said recording layer ranges from about 0.0025 mμ to about 100 mμ and the degree of porosity of said recording layer ranges from about 27 to about 85 volume %.
Claim 3
Dependent Claim
32 words
The process of claim 1, wherein said image-recording material comprises an electrically insulating support having thereon said recording layer and said recording layer comprises an insulating photoconductive thin film containing many cells.
Claim 4
Dependent Claim
22 words
The process of claim 2, wherein said image-recording material contains additionally an electrically insulating or photoconductive thin layer on said recording layer.
Claim 5
Dependent Claim
33 words
The process of claim 1, wherein said image-recording material comprises an electrically conductive support having thereon said recording layer and said recording layer comprises an insulating or photoconductive thin film containing many cells.
Claim 6
Dependent Claim
27 words
The process of claim 4, wherein said image-recording material additionally contains an electrically insulating or photoconductive thin layer between said recording layer and said electrically conductive support.
Claim 7
Dependent Claim
42 words
The process of claim 1, wherein said image-recording material comprises an electrically conductive support having thereon said recording layer sandwiched between electrically insulating or photoconductive thin films with said recording layer comprising an electrically insulating or photoconductive thin film containing many pores.
Claim 8
Dependent Claim
43 words
The process of claim 1, wherein said image-recording material comprises an electrically conductive support having thereon said recording layer and said recording layer comprises an insulating or photoconductive thin film containing many cells and/or pores with an insulating or photoconductive thin film thereon.
Claim 9
Dependent Claim
42 words
The process of claim 1, wherein said recording layer comprises a layer of an organic or inorganic material or mixture thereof having said many cells and/or pores dispersed therein and a specific resistance of at least about 10 9 ohm-cm or higher.
Claim 10
Dependent Claim
20 words
The process of claim 1, wherein the thickness of said recording layer ranges from about 0.5μ to about 1 mm.
References Cited (Backward Citations)
US4038545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |