Patent US3558893A successfully refreshed from Google Patents.
US3558893A
Expired / Lapsed
US
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X- and gamma-ray sensitive image intensification tube
Assignee: Philips Nuclear Medicine Inc
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Filing: 1967-01-30
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Granted: 1971-01-26
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Expires: 1987-01-30
Abstract
Abstract The invention relates to an X- and Gamma-ray sensitive image intensification tube for use in a so-called gamma camera or the like, which tube preferably has a single crystal input phosphor.
Inventors
- 👤 Jack Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:40
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/615; C09K11/616; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1645; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; H01J31/00; H01J31/08; H01J31/50; H01J31/501
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
12 words
The image device of claim 1 wherein said sheet is cesium iodide.
Claim 2
Dependent Claim
13 words
The image device of claim 1 wherein said sheet is a single crystal.
Claim 3
Dependent Claim
16 words
The image device of claim 1 wherein said sheet is a single crystal of cesium iodide.
Claim 4
Dependent Claim
144 words
An image intensification tube responsive to stimulation by gamma energy or the like comprising: a. an evacuated envelope having an input end and an output phosphor spaced therefrom; b. a dish-shaped light-emissive layer near said input end and composed of a single crystalline sheet of photoluminescent material; c. an electron-emissive layer deposited near an inner surface of said light-emissive layer such that light photons emitted by said light-emissive layer stimulate said electron-emissive layer and cause the latter layer to emit electrons; d. means for accelerating electrons from said electron-emissive layer against said output phosphor; e. said dish shape of said light-emissive layer and said electron layer being substantially contoured to the shape of an accelerating electron field produced by said acceleration means so as to be focused therewith; and f. a mounting means supporting said light-emissive layer and electron-emissive layer near said input end.
Claim 5
Dependent Claim
16 words
The tube of claim 5 wherein said photoluminescent material is a single crystal of cesium iodide.
Claim 6
Dependent Claim
13 words
The tube of claim 5 wherein said photoluminescent material is a single crystal.
Claim 7
Dependent Claim
12 words
The tube of claim 5 wherein said photoluminescent material is cesium iodide.
Claim 8
Dependent Claim
33 words
The tube of claim 5 wherein said photoluminescent material is of sufficient thickness to absorb about 30 perCent of source energy of 150 kev. or less and is transparent to its own light.
Claim 9
Dependent Claim
20 words
The tube of claim 5 wherein said photoluminescent material can withstand temperatures of 300* F. without distortion or other degradation.
Claim 10
Dependent Claim
33 words
The tube of claim 5 wherein said mounting means is open at a central portion whereby entering energy passing through said central portion is not filtered or otherwise obstructed by said mounting means.
Claim 11
Independent Claim
135 words
The method of forming an input gamma ray sensitive structure for an image intensification tube comprising the steps of: a. heat softening a single crystal of cesium iodide; b. molding the single crystal of cesium iodide while heat softened to a dish-shaped configuration having a concave output surface to form a photoemissive layer; c. deposition an electron-emissive layer on the output side of said formed, side-shaped cesium iodide crystal with the electron layer and crystal in sufficiently close juxtaposition that light energy emitted by the crystal stimulates said electron-emissive layer and causes the emission of electrons when in use; and d. securing a mounting means to the periphery of said photoemissive layer and mounting said layers in an envelope with the convex surface of the photoemissive layer oriented toward an input end of said envelope.
Claim 12
Dependent Claim
30 words
The method of claim 12 wherein the depositing step is on a barrier layer and including the step of providing a barrier layer between the electron-emissive layer and the crystal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |