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US4089799A
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Luminescent fluoride
Assignee: US Philips Corp
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Filing: 1977-07-01
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Granted: 1978-05-16
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Expires: 1997-07-01
Abstract
Abstract Luminescent bivalent europium-activated fluoride according to the formula AB1-x-yMgxEuyF3, wherein A represents cesium and/or rubidium and B calcium and/or strontium and wherein 0.10 </= X </= 0.
Inventors
- 👤 Johannes Leonardus Sommerdijk
- 👤 Francisca Maria Johanna Henrica Hoex-Strik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:57
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/02; C07D309/08; C07D309/10; C07D309/12; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7732; C09K11/7733
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A luminescent bivalent europium-activated fluoride according to the formula AB.sub.1-x-y Mg.sub.x Eu.sub.y F.sub.3, wherein A represents cesium and/or rubidium and B represents calcium and/or strontium and wherein 0.10 ≦ x ≦ 0.90 0.001 ≦ y ≦ 0.20 x + y ≦ 0.95; said luminescent fluoride having a higher quantum efficiency than the corresponding luminescent fluoride of the above formula in which either Mg or B is absent therefrom.
Claim 2
Dependent Claim
68 words
A luminescent bivalent europium-activated fluoride according to the formula AB.sub.1-x-y Mg.sub.x Eu.sub.y F.sub.3, wherein A represents cesium and/or rubidium and B represents calcium and/or strontium and wherein 0.10 ≦ x ≦ 0.90 0.001 ≦ y ≦ 0.20 x + y ≦ 0.95; said luminescent fluoride having a higher quantum efficiency than the corresponding luminescent fluoride of the above formula in which either Mg or B is absent therefrom.
Claim 3
Dependent Claim
21 words
A luminescent fluoride as claimed in claim 1, characterized in that 0.50 ≦ x ≦ 0.80 0.01 ≦ y ≦ 0.10
Claim 4
Dependent Claim
18 words
A luminescent fluoride as claimed in claim 1, characterized in that A is cesium and B is calcium.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |