US2999818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphors and methods for producing same
Assignee: GTE Sylvania Inc
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Filing: 1959-11-16
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Granted: 1961-09-12
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Expires: 1979-11-16
Abstract
No abstract record available.
Inventors
- 👤 George H Morrison
- 👤 Frank C Palilla
- 👤 Zloczower Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:53
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A PROCESS FOR PRODUCING AN ELECTROLUMINESCENT PHOSPHOR FROM A COPPER ACTIVATED, CHLORIDE COACTIVATED CATHODOLUMINESCENT ZINC-CADMIUM SULFIDE PHOSPHOR, SAID PROCESS COMPRISING THE STEPS OF MIXING SAID CATHODOLUMINESCENT PHOSPHOR WITH COPPER SULFATE, THE AMOUNT OF COPPER ADDED, AS EXPRESSED IN A PERCENTAGE BY WEIGHT OF THE CATHODOLUMINESCENT PHOSPHOR, BEING ABOUT 35% FIRING SAID MIXTURE AT A TEMPERATURE FALLING WITHIN THE APPROXIMATE RANGE 700*-900*C., AND WASHING SAID FIRED MIXTURE WITH AN ALKALI CYANIDE SOLUTION TO REMOVE ALL EXCESS COPPER THEREFROM, THUS PRODUCING A WHITE EMITTING ELECTROLUMINESCENT PHOSPHOR.
References Cited (Backward Citations)
US2821509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |