US2689190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent screen and method for forming same
Assignee: Westinghouse Electric Corp
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Filing: 1951-12-05
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Granted: 1954-09-14
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Expires: 1971-12-05
Abstract
No abstract record available.
Inventors
- 👤 Walter J Hushley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:19
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; G; G21; G21K; G21K4/00; H01J29/18; H01J29/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
THE METHOD OF FORMING A FLUORESCENT SCREEN WHICH CONSISTS ESSENTIALLY OF COATING A BACKING PLATE WITH A LAYER OF A FLUORESCENT MATERIAL HAVING A MELTING POINT ABOVE 650* C., SETTLING ON THE SURFACE OF SAID LAYER THROUGH A LIQUID SELECTED FROM THE GROUP WHICH CONSISTS OF CARBON TETRACHLORIDE, TRICHLOROETHYLENE AND ETHER A THIN LAYER OF POWDERED GLASS FORMED BY FIRING A MIXTURE CONSISTING BY WEIGHT ESSENTIALLY OF 60% TO 70% B2O3, 15% TO 25% SIO2, 1% TO 4% AL2O3, 1% TO 3% MGO, AND 7% TO 15% OF OXIDES OF THE ALKALI METALS SODIUM, POTASSIUM AND LITHIUM, WITH SODIUM OXIDE FORMING ABOUT ONE-HALF, AND POTASSIUM OXIDE AND LITHIUM OXIDE EACH ABOUT ONE QUARTER OF SAID ALKALI OXIDES, AND HEATING THE RESULTING STRUCTURE TO ABOUT 600* C. IN AN ATMOSPHERE WHICH IS CHEMICALLY INERT TO SAID PLATE AND SAID LAYERS.
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) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |