US2948635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor evaporation method and apparatus
Assignee: General Electric Co
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Filing: 1959-01-12
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Granted: 1960-08-09
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Expires: 1979-01-12
Abstract
No abstract record available.
Inventors
- 👤 Lewis R Koller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:41
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A METHOD OF PRODUCING A LUMINESCENT SCREEN COMPRISING THE STEPS OF HEATING A SCREEN SUBSTRATE TO A TEMPERATURE OF FROM 400*C. TO 700*C. IN AN ENCLOSURE HAVING AN ATMOSPHERE OF HYDROGEN CHLORIDE GAS, MAINTAINING THE WALLS OF SAID ENCLOSURE AT A TEMPERATURE AT LEAST AS GREAT AS THE TEMPERATURE OF SAID SUBSTRATE, EVAPORATING IN THE REGION OF SAID SUBSTRATE A LUMINESCENT PHOSPHOR INCLUDING A HOST MATERIAL, AN ACTIVATOR AND A CHLORINE COACTIVATOR, SAID CHLORINE COACTIVATOR HAVING A VAPOR PRESSURE HIGHER THAN THAT OF SAID HOST MATERIAL AND SAID ACTIVATOR WHEREBY SAID CHLORINE TENDS TO RE-EVAPORATE FROM SAID HEATED SUBSTRATE LEAVING THE PHOSPHOR DEPOSITED THEREON DEFICIENT IN SAID COACTIVATO AND CONTINUOUSLY REPLENISHING AND CIRCULATING HYDROGEN CHLORIDE GAS IN SAID ENCLOSURE TO INCREASE THE CONCENTRATION OF CHLORINE IN THE REGION OF SAID HEATED SUBSTRATE AND REPLENISH THE CHLORINE RE-EVAPORATED THEREFROM AND ASSURE THE INCLUSION IN SAID DEPOSITED PHOSPHOR OF AN ADEQUATE QUANTITY OF CHLORINE COACTIVATOR.
Claim 2
Independent Claim
153 words
A METHOD OF PRODUCING A LUMINESCENT SCREEN COMPRISING THE STEPS OF HEATING A SCREEN SUBSTRATE TO A TEMPERATURE OF FROM 400*C. TO 700*C. IN AN ENCLOSURE HAVING AN ATMOSPHERE OF HYDROGEN CHLORIDE GAS, MAINTAINING THE WALLS OF SAID ENCLOSURE AT A TEMPERATURE AT LEAST AS GREAT AS THE TEMPERATURE OF SAID SUBSTRATE, EVAPORATING IN THE REGION OF SAID SUBSTRATE A LUMINESCENT PHOSPHOR INCLUDING A HOST MATERIAL, AN ACTIVATOR AND A CHLORINE COACTIVATOR, SAID CHLORINE COACTIVATOR HAVING A VAPOR PRESSURE HIGHER THAN THAT OF SAID HOST MATERIAL AND SAID ACTIVATOR WHEREBY SAID CHLORINE TENDS TO RE-EVAPORATE FROM SAID HEATED SUBSTRATE LEAVING THE PHOSPHOR DEPOSITED THEREON DEFICIENT IN SAID COACTIVATO AND CONTINUOUSLY REPLENISHING AND CIRCULATING HYDROGEN CHLORIDE GAS IN SAID ENCLOSURE TO INCREASE THE CONCENTRATION OF CHLORINE IN THE REGION OF SAID HEATED SUBSTRATE AND REPLENISH THE CHLORINE RE-EVAPORATED THEREFROM AND ASSURE THE INCLUSION IN SAID DEPOSITED PHOSPHOR OF AN ADEQUATE QUANTITY OF CHLORINE COACTIVATOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |