Patent US4515706A successfully refreshed from Google Patents.
US4515706A
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US
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Rare earth oxyfluoride barium fluoride halide phosphor
Assignee: Toshiba Corp
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Filing: 1984-05-30
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Granted: 1985-05-07
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Expires: 2004-05-30
Abstract
Abstract A compound having the general formula aReOF.(1-a)Ba.sub.(1-X) M.sub.x FX:Eu.sub.y, where Re is one element selected from the group consisting of Lu and Y, M is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Zn, and Cd, X is at least one element selected from the group consisting of Cl, Br, and I, a is a positive number less than or equal to 0.6, x is in the range from 0 to 0.5, inclusive, and y is in the range from 10 -6 to 2×10 -1 , inclusive, is useful as a phosphor, especially in X-ray imaging.
Inventors
- 👤 Takeshi Takahara
- 👤 Tsutomu Ishii
- 👤 Yasuhiro Shirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:06
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7788
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A phosphor having the formula aReOF.(1-a)Ba.sub.(1-x) M.sub.x FX:Eu.sub.y, where: Re is one element selected from the group consisting of Lu and Y; M is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Zn, and Cd; X is at least one element selected from the group consisting of Cl, Br, and I; a is greater than zero but less than or equal to 0.6; x is in the range from 0 to 0.5, inclusive; y is in the range from 10 -6 to 2×10 -1 , inclusive; and where "a" is an amount such that the phosphor exhibits a higher luminous intensity than said phosphor absent ReOF when stimulated by light having a wavelength of 550 nm after being exposed to X-ray radiation.
Claim 2
Dependent Claim
128 words
A phosphor having the formula aReOF.(1-a)Ba.sub.(1-x) M.sub.x FX:Eu.sub.y, where: Re is one element selected from the group consisting of Lu and Y; M is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Zn, and Cd; X is at least one element selected from the group consisting of Cl, Br, and I; a is greater than zero but less than or equal to 0.6; x is in the range from 0 to 0.5, inclusive; y is in the range from 10 -6 to 2×10 -1 , inclusive; and where "a" is an amount such that the phosphor exhibits a higher luminous intensity than said phosphor absent ReOF when stimulated by light having a wavelength of 550 nm after being exposed to X-ray radiation.
Claim 3
Dependent Claim
17 words
A phosphor according to claim 1, wherein a is in the range from 0.05 to 0.5, inclusive.
Claim 4
Dependent Claim
15 words
A phosphor according to claim 1, wherein x is less than or equal to 0.2.
Claim 5
Dependent Claim
20 words
A phosphor according to claim 1, wherein y is in the range from 10 -5 to 10 -2 , inclusive.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |