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US5112700A
Expired / Lapsed
US
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Phosphor composition and x-ray intensifying screen capable of emitting principally in the spectral region of native silver halide sensitivity
Assignee: Carestream Health Inc
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Filing: 1991-05-28
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Granted: 1992-05-12
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Expires: 2011-05-28
Abstract
Abstract A phosphor composition is disclosed containing a titanium activated hafnium zirconium germanate phosphor which emits electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity. To maximize the intensity of emission the ratio of host metals satisfies the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and halnium and x is 0.25 to -0.70. An X-ray intensifying screen is disclosed containing the phosphor composition.
Inventors
- 👤 Patrick M. Lambert
- 👤 Philip S. Bryan
- 👤 Gregory S. Jarrold
- 👤 Christine M. Towers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/677; G; G21; G21K; G21K4/00; G21K2004/06; G21K2004/10; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
An intensifying screen comprised of a support and a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity, characterized in that the phosphor is titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and hafnium and x is 0.25 to -0.70.
Claim 2
Dependent Claim
72 words
An intensifying screen comprised of a support and a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity, characterized in that the phosphor is titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and hafnium and x is 0.25 to -0.70.
Claim 3
Dependent Claim
72 words
An intensifying screen comprised of a support and a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the 300 to 500 nm region of the spectrum, characterized in that the phosphor consists essentially of oxygen and metals satisfying the relationship: [(Hf.sub.1-z Zr.sub.z).sub.1+x Ge.sub.1-x ].sub.1-y Ti.sub.2y where x is 0.25 to -0.70; 2y is 5×10 -4 to 0.15; and z is at least 4×10 -4 .
Claim 4
Dependent Claim
72 words
An intensifying screen comprised of a support and a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the 300 to 500 nm region of the spectrum, characterized in that the phosphor consists essentially of oxygen and metals satisfying the relationship: [(Hf.sub.1-z Zr.sub.z).sub.1+x Ge.sub.1-x ].sub.1-y Ti.sub.2y where x is 0.25 to -0.70; 2y is 5×10 -4 to 0.15; and z is at least 4×10 -4 .
Claim 5
Dependent Claim
16 words
An intensifying screen according to claim, 2 further characterized in that x is up to 0.20.
Claim 6
Dependent Claim
16 words
An intensifying screen according to claim 3 further characterized in that x is up to 0.15.
Claim 7
Dependent Claim
16 words
An intensifying screen according to claim 2 further characterized in that x less negative than -0.50.
Claim 8
Dependent Claim
18 words
An intensifying screen according to claim 2 further characterized in that 2y is at least 5×10 -3 .
Claim 9
Dependent Claim
16 words
An intensifying screen according to claim 2 further characterized in that 2y is up to 0.07.
Claim 10
Dependent Claim
16 words
An intensifying screen according to claim 2 further characterized in that 2y is less than 0.5.
Claim 11
Dependent Claim
16 words
An intensifying screen according to claim 8 further characterized in that z is up to 0.4.
Claim 12
Dependent Claim
16 words
An intensifying screen according to claim 9 further characterized in that z is up to 0.3.
Claim 13
Dependent Claim
18 words
An intensifying screen according to claim 2 further characterized in that z is at least 1×10 -3 .
Claim 14
Dependent Claim
18 words
An intensifying screen according to claim 11 further characterized in that z is at least 2×10 -3 .
Claim 15
Dependent Claim
37 words
A phosphor composition comprised of titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and hafnium and x is 0.25 to -0.70.
Claim 16
Dependent Claim
37 words
A phosphor composition comprised of titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and hafnium and x is 0.25 to -0.70.
Claim 17
Dependent Claim
45 words
A phosphor composition according to claim 13 in which the phosphor consists essentially of oxygen and metals satisfying the relationship: [(Hf.sub.1-z Zr.sub.z).sub.1+x Ge.sub.1-x ].sub.1-y Ti.sub.2y where x is 0.25 to -0.70; 2y is 5×10 -4 to 0.15; and z is at least 4×10 -4 .
Claim 18
Dependent Claim
14 words
A phosphor composition according to claim 14 in which x is up to 0.20.
Claim 19
Dependent Claim
14 words
A phosphor composition according to claim 15 in which x is up to 0.15.
Claim 20
Dependent Claim
14 words
A phosphor composition according to claim 14 in which x less negative than -0.50.
Claim 21
Dependent Claim
16 words
A phosphor composition according to claim 14 in which 2y is at least 5×10 -3 .
Claim 22
Dependent Claim
14 words
A phosphor composition according to claim 14 in which 2y is up to 0.07.
Claim 23
Dependent Claim
14 words
A phosphor composition according to claim 14 in which 2y is less than 0.5.
Claim 24
Dependent Claim
14 words
A phosphor composition according to claim 20 in which z is up to 0.4.
Claim 25
Dependent Claim
14 words
A phosphor composition according to claim 21 in which z is up to 0.3.
Claim 26
Dependent Claim
16 words
A phosphor composition according to claim 14 in which z is at least 1×10 -3 .
Claim 27
Dependent Claim
16 words
A phosphor composition according to claim 23 in which z is at least 2×10 -3 .
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) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |