US3647707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali monosulfide recrystallization of lanthanide oxysulfide luminescent material
Assignee: General Electric Co
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Filing: 1969-09-08
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Granted: 1972-03-07
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Expires: 1989-09-08
Abstract
Abstract Y2O2S:EU OR RELATED LUMINESCENT MATERIALS ARE RECRYSTALLIZED IN LIQUID NA2S OR OTHER ALKALI MONOSULFIDES TO INCREASE PARTICLE SIZE AND IMPROVE CRYSTALLINITY AND LIGHT PRODUCTION OF THE LUMINESCENT MATERIAL. THE STARTING MATERIAL IS PREFERABLY PREPARED BY FIRING EUROPIUM-CONTAINING Y2O3 OR RELATED OXIDES IN H2S GAS.
Inventors
- 👤 George R Gillooly
- 👤 Jacob G Rabatin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:35
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |