US3704232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of sulfide phosphors
Assignee: GTE Sylvania Inc
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Filing: 1970-09-24
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Granted: 1972-11-28
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Expires: 1990-09-24
Abstract
Abstract AN IMPROVED PROCESS FOR PRODUCING PHOSPHOR COMPOSITIONS HAVING A MULTIVALENT METAL SULFIDE HOST AND A SOURCE OF ACTIVATOR MATERIAL COMPRISING AT LEAST ONE METAL HAVING A TRIPOSITIVE VALENCE WHICH COMPRISES ADDING AT LEAST ABOUT 0.5% BARIUM CHLORIDE FLUX MATERIAL AND HEATING THE MIXTURE IN AN ATMOSPHERE OF CARBON DISULFIDE AND AN INERT GAS CARRIER AT A VOLUMETRIC RATIO OF CARBON DISULFIDE TO INERT GAS OF AT LEAST ABOUT 1:50.
Inventors
- 👤 James O Frey
- 👤 Harry L Marshall
- 👤 Henry B Minnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/56; C09K11/562
Claims Analysis
Total Claims: 0
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |