US4855587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray image intensifier tube with carbon-reinforced plastic foil entrance window
Assignee: US Philips Corp
•
Filing: 1988-05-04
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Granted: 1989-08-08
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Expires: 2008-05-04
Abstract
Abstract An X-ray image intensifier tube comprises an entrance window which is composed of a carbon fibre reinforced plastics foil which is covered with a metal layer. The plastics foil has a comparatively low absorption and the metal layers can be constructed so as to be sufficiently thin and from suitable materials such that only a low absorption occurs therein. The metal layers ensure that the entrance window is suitably vacuumtight and allow for simple vacuumtight connection of the entrance window to the further envelope.
Inventors
- 👤 Caspard H. J. Creusen
- 👤 Johannes K. E. Colditz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:01
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
An X-ray image intensifier tube (1) comprising an entrance window (2) and an exit window (4) which form part, together with a cylindrical jacket (6), of a vacuumtight envelope (8) which accommodates an entrance screen (10) with a luminescent layer (26) and a photocathode (24), a photo electron imaging electrode system (15) and an exit screen (22), characterized in that the entrance window (2) comprises a carbon fibre reinforced plastics foil covered with a metal layer (32, 34).
Claim 2
Dependent Claim
78 words
An X-ray image intensifier tube (1) comprising an entrance window (2) and an exit window (4) which form part, together with a cylindrical jacket (6), of a vacuumtight envelope (8) which accommodates an entrance screen (10) with a luminescent layer (26) and a photocathode (24), a photo electron imaging electrode system (15) and an exit screen (22), characterized in that the entrance window (2) comprises a carbon fibre reinforced plastics foil covered with a metal layer (32, 34).
Claim 3
Dependent Claim
27 words
An X-ray image intensifier tube as claimed in claim 1, characterized in that the plastics foil is covered with a metal layer (32, 34) on both sides.
Claim 4
Dependent Claim
32 words
An X-ray image intensifier tube as claimed in claim 1 or 2, characterized in that different elements are used for the metal cover layers on the inner side and the outer side.
Claim 5
Dependent Claim
29 words
An X-ray image intensifier tube as claimed in claim 1 or 2, characterized in that the entrance screen is arranged directly on an inner side of the entrance window.
Claim 6
Dependent Claim
27 words
An X-ray image intensifier tube as claimed in claim 1 or 2, characterized in that the metal layer consists of aluminium at least on the inner side.
Claim 7
Dependent Claim
32 words
An X-ray image intensifier tube as claimed in claim 1 or 2, characterized in that the entrance window is connected to the cylindrical jacket portion by way of an intermediate ring (38).
Claim 8
Dependent Claim
40 words
An X-ray image intensifier tube as claimed in claim 6, characterized in that a steel intermediate ring (38) is connected to the cylindrical jacket (6) via a welded seam (42) and to the entrance window via a thermo-compression seal (43).
Claim 9
Dependent Claim
42 words
An X-ray image intensifier tube as claimed in claim 1 or 2, characterized in that the entrance window is connected to the cylindrical jacket portion so that a side face of the plastics foil is completely covered with a vacuumtight material (46).
References Cited (Backward Citations)
US4238043A
Cited
US4331898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |