Patent US3007992A successfully refreshed from Google Patents.
US4069438A
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Photoemissive cathode and method of using comprising either cadmiumtelluride or cesium iodide
Assignee: General Electric Co
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Filing: 1975-09-18
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Granted: 1978-01-17
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Expires: 1995-09-18
Abstract
Abstract A device for the electrostatic recording of x-ray images comprises two spaced electrodes with a gas-filled gap therebetween. One of the electrodes comprises a layer of an ultraviolet emitting fluorescent material and a layer of an air-exposable ultraviolet-sensitive photoemitting material. A plastic sheet is adjacent to the other electrode. An electric field is applied across the gap to accelerate photoelectrons emitted by the photoemitting material. The electrostatic image formed on the plastic sheet is developed xerographically after the exposure.
Inventors
- 👤 John M. Houston
- 👤 James R. Young
- 👤 Nathan R. Whetten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/054; G03G15/0545
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A photocathode electrode adapted for operation in an oxidizing atmosphere comprising: a layer of a material selected from the group consisting of cadmium telluride and cesium iodide disposed so as to be impinged on by photons, said photons being substantially in the ultraviolet spectral region whereby electrons are emitted in response to said photons.
Claim 2
Dependent Claim
54 words
A photocathode electrode adapted for operation in an oxidizing atmosphere comprising: a layer of a material selected from the group consisting of cadmium telluride and cesium iodide disposed so as to be impinged on by photons, said photons being substantially in the ultraviolet spectral region whereby electrons are emitted in response to said photons.
Claim 3
Dependent Claim
12 words
The photocathode of claim 1 wherein said material consists of cadmium telluride.
Claim 4
Dependent Claim
12 words
The photocathode of claim 1 wherein said material consists of cesium iodide.
Claim 5
Independent Claim
59 words
A method for using a layer of a material, comprising the steps of: disposing a layer of a material selected from the group consisting of cesium iodide and cadmium telluride in an oxidizing environment; directing ultraviolet photons onto said layer; and collecting electrons which are emitted from said layer in response to interactions of said layer with said photons.
Claim 6
Independent Claim
59 words
A method for using a layer of a material, comprising the steps of: disposing a layer of a material selected from the group consisting of cesium iodide and cadmium telluride in an oxidizing environment; directing ultraviolet photons onto said layer; and collecting electrons which are emitted from said layer in response to interactions of said layer with said photons.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein said layer consists of cadmium telluride.
Claim 8
Dependent Claim
12 words
The method of claim 4 wherein said layer consists of cesium iodide.
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |