US4447721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel type X-ray image intensifier tube and radiographic camera system
Assignee: Diagnostic Information Inc
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Filing: 1981-07-31
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Granted: 1984-05-08
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Expires: 2001-07-31
Abstract
Abstract An x-ray image intensifier tube for medical x-ray diagnostic use having a tube envelope, an inwardly concave, iron nickel, chromium alloy input window, an output display screen, a scintillator photocathode screen suspended within the envelope and in between the input window and the output screen, and a glass output window.
Inventors
- 👤 Shih-Ping Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/505; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
An X-ray sensitive image intensifier tube comprising a tube envelope, a metallic input window in the tube envelope, the input window being made of an alloy of iron, chromium and nickel, a scintillator screen adjacent the input window, a photocathode layer parallel and immediately adjacent to the scintillator screen, a phosphor display screen parallel to and spaced apart from the photocathode layer, and means for connecting an external source of high voltage between the photocathode layer and the output display screen, and wherein the tube envelope houses the scintillator screen, photocathode layer and display screen.
Claim 2
Dependent Claim
95 words
An X-ray sensitive image intensifier tube comprising a tube envelope, a metallic input window in the tube envelope, the input window being made of an alloy of iron, chromium and nickel, a scintillator screen adjacent the input window, a photocathode layer parallel and immediately adjacent to the scintillator screen, a phosphor display screen parallel to and spaced apart from the photocathode layer, and means for connecting an external source of high voltage between the photocathode layer and the output display screen, and wherein the tube envelope houses the scintillator screen, photocathode layer and display screen.
Claim 3
Dependent Claim
27 words
An X-ray sensitive image intensifier tube as recited in claim 1, wherein the input window is made of 17-7 PH type of precipitation hardened, chromium-nickel stainless steel.
References Cited (Backward Citations)
US4140900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |