US4928017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording and reproducing radiographic images
Assignee: Carestream Health Inc
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Filing: 1988-12-14
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Granted: 1990-05-22
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Expires: 2008-12-14
Abstract
Abstract Phosphors constituted by terbium and/or cerium activated lutetium-gadolinium-yttrium silicates have shown a high visible-light emission efficiency upon exposure to high energy radiation. Said phosphors are useful in the methods for recording and reproducing high energy radiation images.
Inventors
- 👤 Sibylle Kemmler-Sack
- 👤 Romano Morlotti
- 👤 Jurgen Reichardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/77742
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A method of direct radiography for getting a radiograph from an X-ray image of an object, comprising the steps of: (a) causing an X-ray radiation to pass through the object, (b) collecting the passed radiation image onto a phosphor screen containing a phosphor capable of converting the radiation image into a light image, (c) collecting the light image onto a photographic film capable of being impressed by the light image, said method being further characterized in that said phosphor is a terbium and cerium activated ternary lutetium-gadolinium-yttrium orthosilicate phosphor according to the formula: (Lu.sub.x Gd.sub.y Y.sub.z).sub.2 SiO.sub.5 : aTb, bCe wherein x+y+z=1, 0.15≦x≦0.4.5, 0.15≦y≦0.45, 0.15≦z≦0.45, 0.01≦a≦0.2, 0.0008≦b≦0.0012.
Claim 2
Independent Claim
107 words
A method of direct radiography for getting a radiograph from an X-ray image of an object, comprising the steps of: (a) causing an X-ray radiation to pass through the object, (b) collecting the passed radiation image onto a phosphor screen containing a phosphor capable of converting the radiation image into a light image, (c) collecting the light image onto a photographic film capable of being impressed by the light image, said method being further characterized in that said phosphor is a terbium and cerium activated ternary lutetium-gadolinium-yttrium orthosilicate phosphor according to the formula: (Lu.sub.x Gd.sub.y Y.sub.z).sub.2 SiO.sub.5 : aTb, bCe wherein x+y+z=1, 0.15≦x≦0.4.5, 0.15≦y≦0.45, 0.15≦z≦0.45, 0.01≦a≦0.2, 0.0008≦b≦0.0012.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |