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US4829548A
Expired / Lapsed
US
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Dental X-ray examination apparatus
Assignee: US Philips Corp
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Filing: 1984-06-18
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Granted: 1989-05-09
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Expires: 2004-06-18
Abstract
Abstract An X-ray examination apparatus, for example, for dental use, comprises an extraoral radiation entrance screen which is displaceable in a plane which is transverse with respect to a normal thereto. Consequently, distortion-free imaging can be performed for the entire set of teeth and the adjoining regions of the jaws.
Inventors
- 👤 Jan H. Halm
- 👤 Leonardus H. J. Post
- 👤 Johannes F. van Otterdijk
- 👤 Paul F. van der Stelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:27
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/44; A61B6/4429; A61B6/4464; A61B6/50; A61B6/51; A61B6/512; G; G01; G01N; G01N23/00; G01N23/02; G01N23/04; G01N23/043; H; H05; H05G; H05G1/00; H05G1/08; H05G1/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
An X-ray examination apparatus comprising: an X-ray tube having an anode pipe; an X-ray detection device having an entrance screen; and means for displaceably connecting the X-ray tube and the X-ray detection device so that the entrance screen of the X-ray detection device can be displaced relative to the X-ray tube in two directions in a plane which is transverse to a normal to the entrance screen; characterized in that the means for displaceably connecting the X-ray tube and the X-ray detection device comprises first and second screw threaded spindle drives, the first spindle drive displacing the entrance screen in a first direction and the second spindle drive displacing the entrance screen in a second direction perpendicular to the first direction.
Claim 2
Dependent Claim
121 words
An X-ray examination apparatus comprising: an X-ray tube having an anode pipe; an X-ray detection device having an entrance screen; and means for displaceably connecting the X-ray tube and the X-ray detection device so that the entrance screen of the X-ray detection device can be displaced relative to the X-ray tube in two directions in a plane which is transverse to a normal to the entrance screen; characterized in that the means for displaceably connecting the X-ray tube and the X-ray detection device comprises first and second screw threaded spindle drives, the first spindle drive displacing the entrance screen in a first direction and the second spindle drive displacing the entrance screen in a second direction perpendicular to the first direction.
Claim 3
Dependent Claim
25 words
An X-ray examination apparatus as claimed in claim 1, characterized in that the detection device comprises an image intensifier tube having a flat entrance screen.
Claim 4
Dependent Claim
31 words
An X-ray examination apparatus as claimed in claim 1, characterized in that the detection device comprises an X-ray luminescent screen and a device for recording optical images generated in the screen.
Claim 5
Dependent Claim
34 words
An X-ray examination apparatus as claimed in claim 1, characterized in that the detection device comprises an X-ray image intensifier tube having an exit screen comprising a mosaic of electron sensitive semiconductor detection elements.
Claim 6
Dependent Claim
19 words
An X-ray examination apparatus as claimed in claim 1, characterized in that the detection device comprises an instant camera.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |