US3710125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary emission enhancer for an x-ray image intensifier
Assignee: Northwestern University
•
Filing: 1970-04-29
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Granted: 1973-01-09
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Expires: 1990-04-29
Abstract
Abstract The number of electrons emitted from a metal surface that is being bombarded by x-rays is increased by utilizing a secondary electron emission process within an insulator, potassium chloride (KCl), that is deposited on a metal, gold (Au) layer. The problem of obtaining a maximum electron yield from these layers is one of optimizing the secondary electron emission in the KCl for a given x-ray energy. This optimization is a function of the thickness of the KCl, its density, temperature, and an internal electric field.
Inventors
- 👤 J Jacobs
- 👤 M Kovac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:49
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/34; G; G21; G21K; G21K4/00; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3425
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
12 words
The couple of claim 1 wherein said metal is a noble metal.
Claim 2
Dependent Claim
10 words
The couple of claim 1 wherein said metal is gold.
Claim 3
Dependent Claim
11 words
The couple of claim 3 wherein said insulator is potassium chloride.
Claim 4
Dependent Claim
23 words
The couple of claim 4 wherein said couple is deposited on a substrate having at least a conductive surface under said metal layer.
Claim 5
Dependent Claim
27 words
The couple of claim 5 wherein said means for establishing said high gradient field is a mesh electrode in contact with the insulator side of said couple.
Claim 6
Dependent Claim
59 words
The couple of claim 5 and a cathode ray tube, said couple being mounted in the end of said tube at a position where said insulation layer is scanned by said cathode ray, a television monitor, and means responsive to said scanning of said insulation layer by said cathode ray for supplying an image signal to said television monitor.
Claim 7
Dependent Claim
39 words
The couple of claim 7 and an x-ray source means for bombarding said couple with x-rays, whereby said insulation layer gives off secondary electrons in the image of a target between the source of said x-rays and said couple.
Claim 8
Dependent Claim
36 words
The couple of claim 8 and means comprising a rare gas amplifier interposed between the target and couple, and means responsive to bombardment of x-rays upon said gas amplifier for releasing electrons from said metal layer.
Claim 9
Dependent Claim
44 words
A couple comprising a layer of gold and a layer of potassium chloride insulation material deposited on a substrate and positioned in an x-ray field, said potassium chloride having a density and a temperature for yielding high levels of secondary emission for producing F-centers.
Claim 10
Dependent Claim
13 words
The couple of claim 1 where said insulator is an alkali metal halide.
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |