US4088894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(Ba,Sr)F, (Cl,Br) : Eu+2 X-Ray image converters utilizing LaOBr (Tm,Tb) phosphors
Assignee: General Electric Co
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Filing: 1976-12-13
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Granted: 1978-05-09
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Expires: 1996-12-13
Abstract
Abstract The performance characteristics of (Ba,Sr)F, (Cl,Br) : Eu +2 phosphors may be improved by combining these phosphors with particular rare earth oxyhalide phosphors. In the preferred embodiments, the latter phosphors have relatively small and well-formed crystalline particles which become interspersed with the larger crystalline particles of the (Ba,Sr)F, (Cl,Br) : Eu +2 phosphor.
Inventors
- 👤 Jacob G. Rabatin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:48
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7732; C09K11/7733; C09K11/7766; C09K11/7767
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
115 words
A physical admixture of phosphors including: a first phosphor, of well-formed relatively small particles, according to the formula: LnOX:Ty wherein Ln is one or more of La and Gd; X is one or more of Cl and Br; Ty is one or more of Tm, Tb and is present as an activator; with a second phosphor, of relatively large particles, according to the formula: Ba.sub.1-A-B Sr.sub.A Eu.sub.B FX wherein A is from about .0 to about 0.5 mole; B is from about .005 to about 0.1 mole; and X is one or more of Cl and Br, the admixture resulting in improved conversion of x-rays to visible light with higher resolution and lower quantum mottle.
Claim 2
Dependent Claim
115 words
A physical admixture of phosphors including: a first phosphor, of well-formed relatively small particles, according to the formula: LnOX:Ty wherein Ln is one or more of La and Gd; X is one or more of Cl and Br; Ty is one or more of Tm, Tb and is present as an activator; with a second phosphor, of relatively large particles, according to the formula: Ba.sub.1-A-B Sr.sub.A Eu.sub.B FX wherein A is from about .0 to about 0.5 mole; B is from about .005 to about 0.1 mole; and X is one or more of Cl and Br, the admixture resulting in improved conversion of x-rays to visible light with higher resolution and lower quantum mottle.
Claim 3
Dependent Claim
25 words
An image converter including the admixed phosphors of claim 1 supported on a backing member, said phosphors being capable of converting x-radiation to longer wavelength.
Claim 4
Dependent Claim
19 words
An image converter as set forth in claim 2 adapted for intensifying the exposure of photographic film to x-radiation.
Claim 5
Dependent Claim
20 words
The subject matter set forth in claim 2 wherein said first phosphor is lanthanum oxybromide coactivated with thulium and terbium.
Claim 6
Dependent Claim
20 words
An image converter set forth in claim 2 wherein said first phosphor is lanthanum oxychloride coactivated with thulium and terbium.
Claim 7
Dependent Claim
20 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxychloride coactivated with thulium and terbium.
Claim 8
Dependent Claim
20 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxybromide coactivated with thulium and terbium.
Claim 9
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is lanthanum oxybromide activated with thulium.
Claim 10
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is lanthanum oxybromide activated with terbium.
Claim 11
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is lanthanum oxychloride activated with thulium.
Claim 12
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is lanthanum oxychloride activated with terbium.
Claim 13
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxybromide activated with thulium.
Claim 14
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxybromide activated with terbium.
Claim 15
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxychloride activated with thulium.
Claim 16
Dependent Claim
18 words
An image converter set forth in claim 2 wherein said first phosphor is gadolinium oxychloride activated with terbium.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |