US2980550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporated phosphor screen
Assignee: Thomas Electronics Inc
•
Filing: 1958-01-15
•
Granted: 1961-04-18
•
Expires: 1978-01-15
Abstract
No abstract record available.
Inventors
- 👤 Seats Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:22
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF FORMING A LUMINESCENT SCREEN IN A CATHODE RAY TUBE WHICH COMPRISES EVAPORATING A ZINC SILICATE PHOSPHOR CONTAINING MANGANESE AND CONDENSING THE VAPOR UPON A HARD GLASS ENVELOPE, FIRING THE CONDENSED PHOSPHOR IN AIR AT A TEMPERATURE OF APPROXIMATELY 600* C. FOR APPROXIMATELY ONE HOUR TO PRODUCE A FIRST TRANSPARENT PHOSPHOR LAYER, EVAPORATING CALCIUM TUNGSTATE, CONDENSING THE VAPOR ON SAID FIRST LAYER, AND FIRING THE SUPERPOSED LAYERS IN AIR AT A TEMPERATURE OF APPROXIMATELY 500*C. FOR APPROXIMATELY ONE HALF HOUR.
Claim 2
Independent Claim
82 words
A METHOD OF FORMING A LUMINESCENT SCREEN IN A CATHODE RAY TUBE WHICH COMPRISES EVAPORATING A ZINC SILICATE PHOSPHOR CONTAINING MANGANESE AND CONDENSING THE VAPOR UPON A HARD GLASS ENVELOPE, FIRING THE CONDENSED PHOSPHOR IN AIR AT A TEMPERATURE OF APPROXIMATELY 600* C. FOR APPROXIMATELY ONE HOUR TO PRODUCE A FIRST TRANSPARENT PHOSPHOR LAYER, EVAPORATING CALCIUM TUNGSTATE, CONDENSING THE VAPOR ON SAID FIRST LAYER, AND FIRING THE SUPERPOSED LAYERS IN AIR AT A TEMPERATURE OF APPROXIMATELY 500*C. FOR APPROXIMATELY ONE HALF HOUR.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |