Rare earth oxide phosphors having inert, non-luminescent layer thereon
Abstract
Abstract A RARE EARTH OXIDE HOST PHOSPHOR HAS INCORPORATED THEREON AN OUTER LAYER OF CHEMICALLY COMBINED FLUORIDE ION THAT IS INERT AND NON-LUMINESCENT. THE COATING INCREASES THE ADHERENCE PROPERTIES OF THE PHOSPHOR IN SLURRY APPLICATION TECHNIQUES FOR THE MANUFACTURE OF TELEVISION SCREENS BY PREVENTING POISONING OF THE PHOSPHOR PARTICLES BY DICHROMATE IONS PRESENT IN THE SLURRY. THE PHOSPHOR IS COATED BY BATHING IN A .05 MOLAR FLUORIDE BATH, IN ACIDIC SOLUTION, ABOUT 400 TO 500 GRAMS OF PHOSPHOR PER LITER OF SOLUTION, AGITATING FOR ABOUT 20 TO 30 MINUTES, AND DECANTING THE ACIDIC SOLUTION, WASHING AND THEN FILTERING AND DRYING THE PHOSPHOR. THE DRYING TEMPERATURE SHOULD BE LESS THAN 200*C. TO PREVENT DISRUPTION OF THE COATING.
Inventors
- 👤 M Hammond
- 👤 R Herner
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |