US3794842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generation of radiographs
Assignee: Horizons Research Inc
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Filing: 1972-12-13
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Granted: 1974-02-26
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Expires: 1992-12-13
Abstract
Abstract Radiographs are generated in an apparatus comprising a fine mesh screen coated with an X-ray sensitive photoconductor by exposing said screen to an X-ray image while said coated screen is in physical contact with an insulating charge-supporting member and while an electrical potential is applied between the screen and an electrically conducting plate located on the side of the insulating member which is opposite the side the coated screen is on, and thereafter electrostatically toning the latent image formed on the charge-supporting member as a consequence of the Xray exposure.
Inventors
- 👤 R Fotland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:45
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/05; G03G15/051; G03G15/054
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
In an apparatus for producing radiographs of an object comprising an X-ray source positioned on one side of an object to be radiographed, and an X-ray image generating assembly disposed on the opposite side of said object; the improved image generating assembly comprising an electrically conductive base layer, a record sheet disposed on said base, consisting of an electrically conductive layer and a charge-supporting insulating layer, with the electrically conducting layer lying on said base, and a conductive woven mesh screen lying on said chargesupporting insulating layer, at least that portion of the woven screen which is in physical contact with said charge-supporting layer being provided with a coating of photoconductive material which becomes electrically conductive when exposed to X-rays, and means for applying a potential between conductive base layer and woven mesh screen.
Claim 2
Dependent Claim
134 words
In an apparatus for producing radiographs of an object comprising an X-ray source positioned on one side of an object to be radiographed, and an X-ray image generating assembly disposed on the opposite side of said object; the improved image generating assembly comprising an electrically conductive base layer, a record sheet disposed on said base, consisting of an electrically conductive layer and a charge-supporting insulating layer, with the electrically conducting layer lying on said base, and a conductive woven mesh screen lying on said chargesupporting insulating layer, at least that portion of the woven screen which is in physical contact with said charge-supporting layer being provided with a coating of photoconductive material which becomes electrically conductive when exposed to X-rays, and means for applying a potential between conductive base layer and woven mesh screen.
Claim 3
Dependent Claim
51 words
The apparatus of claim 1 in which the photoconductive material is selected from the group consisting of selenium, cadmium sulfide, cadmium selenide, lead oxide, and selenium alloyed with at least one element selected from the group consisting of tellurium, sulfur, arsenic, antimony, bismuth, and iodine, and mixtures of said photoconductive materials.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 in which the screen consists of metal and the photoconductor is selenium.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 in which the screen consists of synthetic resin monofilament coated with a conductor.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 in which the image-receiving member is a dielectric coated paper.
Claim 7
Dependent Claim
72 words
A method of producing radiographs which comprises, assembling the apparatus of claim 1 and exposing an object to X-rays, whereby a pattern consisting of X-rays passing through said object falls on said sensitive member, said exposure taking place while a potential is impressed between said screen and said metal base, to form a latent electrostatic image on said charge-supporting insulating layer and next developing a visible manifestation of said latent charge image.
References Cited (Backward Citations)
US2866903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |