US4507560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terbium-activated gadolinium oxysulfide X-ray phosphor
Assignee: Osram Sylvania Inc
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Filing: 1980-06-13
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Granted: 1985-03-26
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Expires: 2000-06-13
Abstract
Abstract An improved (Gd 1-x Tb x ) 2 O 2 S X-ray phosphor, wherein x is from 0.0003 to 0.0045, and persistence causing impurity ions are kept below 5 ppm, exhibits increased brightness in the blue region of the spectrum, while exhibiting acceptably low persistence for X-ray intensifying screen applications.
Inventors
- 👤 James E. Mathers
- 👤 Ramon L. Yale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
An X-ray phosphor having high emission in the blue region of the color spectrum with relatively low persistence, having the formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is within the range of about 0.0003 to about 0.0045, and wherein persistence causing impurity ions are below about 5 parts per million parts by weight of the phosphor.
Claim 2
Dependent Claim
61 words
An X-ray phosphor having high emission in the blue region of the color spectrum with relatively low persistence, having the formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is within the range of about 0.0003 to about 0.0045, and wherein persistence causing impurity ions are below about 5 parts per million parts by weight of the phosphor.
Claim 3
Dependent Claim
93 words
An X-ray intensifying screen comprising a substrate, a screen layer on the substrate comprising particles of an X-ray phosphor in a binder, and a protective layer on the screen layer, wherein the X-ray phosphor has high emission in the blue region of the color spectrum with relatively low persistence and has the molar formula (Gd 1-x Tb x ) 2 O 2 S, and x is within the range of about 0.0003 to about 0.0045 and wherein persistence causing impurity ions are below about 5 parts per million parts by weight of phosphor.
Claim 4
Dependent Claim
93 words
An X-ray intensifying screen comprising a substrate, a screen layer on the substrate comprising particles of an X-ray phosphor in a binder, and a protective layer on the screen layer, wherein the X-ray phosphor has high emission in the blue region of the color spectrum with relatively low persistence and has the molar formula (Gd 1-x Tb x ) 2 O 2 S, and x is within the range of about 0.0003 to about 0.0045 and wherein persistence causing impurity ions are below about 5 parts per million parts by weight of phosphor.
Claim 5
Dependent Claim
35 words
An X-ray phosphor having high emission in the blue region of the color spectrum with relatively low persistence, having the formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is about 0.001.
Claim 6
Dependent Claim
35 words
An X-ray phosphor having high emission in the blue region of the color spectrum with relatively low persistence, having the formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is about 0.001.
Claim 7
Dependent Claim
68 words
An X-ray intensifying screen comprising a substrate, a screen layer on the substrate comprising particles of an X-ray phosphor in a binder, and a protective layer on the screen layer, wherein the X-ray phosphor has high emission in the blue region of the color spectrum with relatively low persistence and has the molar formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is about 0.001.
Claim 8
Dependent Claim
68 words
An X-ray intensifying screen comprising a substrate, a screen layer on the substrate comprising particles of an X-ray phosphor in a binder, and a protective layer on the screen layer, wherein the X-ray phosphor has high emission in the blue region of the color spectrum with relatively low persistence and has the molar formula (Gd 1-x Tb x ) 2 O 2 S, wherein x is about 0.001.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |