US3716714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray image tube having an oxidized vanadium barrier interposed between the scintillator and photocathode
Assignee: Varian Medical Systems Inc
•
Filing: 1968-11-15
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Granted: 1973-02-13
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Expires: 1988-11-15
Abstract
Abstract An X-ray image tube is disclosed having a glass barrier comprising oxidized vanadium interposed between the tube scintillator and photocathode.
Inventors
- 👤 A Niewold
- 👤 J Pon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:03
CPC Classifications
G; 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
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
In an X-ray image tube having a scintillator and a photocathode, the improvement comprising a vitreous, at least partially conductive barrier interposed between the scintillator and photocathode, said barrier comprising a majority by weight of oxidized vanadium.
Claim 2
Dependent Claim
37 words
In an X-ray image tube having a scintillator and a photocathode, the improvement comprising a vitreous, at least partially conductive barrier interposed between the scintillator and photocathode, said barrier comprising a majority by weight of oxidized vanadium.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein said barrier has a visible light transmission of approximately 75 to 80 percent.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said barrier has a thickness of between 20 and 200 angstroms.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein said barrier comprises a minority by weight of phosphorus pentoxide.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 wherein the scintillator comprises an alkali halide.
Claim 7
Dependent Claim
11 words
The apparatus of claim 1 wherein the scintillator comprises cesium iodide.
Claim 8
Dependent Claim
11 words
The apparatus of claim 6 wherein the scintillator further comprises thallium.
Claim 9
Dependent Claim
11 words
The apparatus of claim 6 wherein the scintillator further comprises sodium.
Claim 10
Dependent Claim
12 words
The apparatus of claim 1 wherein the photocathode comprises an alkali antimonide.
Claim 11
Dependent Claim
11 words
The apparatus of claim 1 wherein the photocathode comprises cesium antimonide.
Claim 12
Dependent Claim
11 words
The apparatus of claim 5 wherein the photocathode comprises cesium antimonide.
Claim 13
Dependent Claim
11 words
The apparatus of claim 1 wherein said barrier comprises vanadium pentoxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |