US2956028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for preparing luminescent materials
Assignee: RCA Corp
•
Filing: 1958-05-23
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Granted: 1960-10-11
•
Expires: 1978-05-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/58; C09K11/582; C09K11/584
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
A METHOD FOR PREPARING A LUMINESCENT MATERIAL COMPRISING FIRING AT A TEMPERATURE AT BETWEEN 970 AND 990*C. FOR A PERIOD OF BETWEEN 45 TO 150 MINUTES A MIXTURE CONSISTING ESSENTIALLY OF ZINC SULFIDE CONTAINING ABOUT 0.011 WEIGHT PERCENT OF ZINC SULFIDE CONTAINING COMBINATION OF THE FLUX COMPOUNDS: MAGNESIUM CHLORIDE 2 WEIGHT PERCENT AMMONIUM CHLORIDE 2 WEIGHT PERCENT TRISODIUM PHOSPHATE 0.5 WEIGHT PERCENT
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |