Rare earth oxide phosphors containing alkali metal silicates and germanates
Abstract
Abstract A NEW PHOSPHOR COMPOSITION HAVING INCREASED BRIGHTNESS IS DISCLOSED THAT CONSISTS ESSENTIALLY OF A RARE EARTH OXIDE HOST MATERIAL HAVING A EUROPIUM ACTIVATOR AND SPECIFIC AMOUNTS OF AN ION SELECTED FROM THE GROUP CONSISTING OF SILICATE, GERMANATE AND MIXTURES THEREOF AND SPECIFIC AMOUNTS OF ALKALI METAL IONS SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM AND MIXTURES THEREOF. A PROCESS FOR PRODUCING THE NEW PHOSPHORS AND FOR CONTROLLING THE PARTICLE SIZE THEREOF, COMPRISES INCORPORATING AN ALKALI METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF LITHIUM SILICATE, LITHIUM GERMANATE AND MIXTURES THEREOF WITH THE APPROPRIATE RARE EARTH OXALATE AND SUBJECTING THE MIXTURE TO A TWO STEP HEATING PROCESS.
Inventors
- 👤 Ramon L Yale
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |