Patent US2621134A successfully refreshed from Google Patents.
US2621134A
Expired / Lapsed
US
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Method of depositing luminescent powdered material on surfaces by sedimentation
Assignee: The General Electric Company PLC
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Filing: 1950-04-08
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Granted: 1952-12-09
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Expires: 1970-04-08
Abstract
No abstract record available.
Inventors
- 👤 Welch Eric Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:59
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J9/223
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
A METHOD OF FORMING UPON A GLASS SURFACE A LUMINESCENT SCREEN COMPOSED OF CRYSTALLINE INORGANIC LUMINESCENT POWDER WHICH IS SUBSTANTIALLY INSOLUBLE IN WATER AND WHICH CONSISTS SUBSTANTIALLY OF PARTICLES NOT LARGER THAN 30 MICRONS IN DIAMETER, WHICH METHOD COMPRISES THE STEPS OF DEPOSITING A LAYER OF SAID POWDER UPON SAID SURFACE BY SEDIMENTATION FROM A SUSPENSION OF THE POWDER IN AN AQUEOUS SUSPENDING LIQUID CONTAINING IN SOLUTION A WATER-SOLUBLE ALGINATE IN A CONCENTRATION BETWEEN 30 MILLIGRAMS AND 2.5 GRAMS PER LITRE OF THE SUSPENDING LIQUID, REMOVEILNG THE SUPERNATANT SUSPENDING LIQUID FROM THE DEPOSITED LAYER OF LUMINESCENT POWDER, AND DRYING THE SAID LAYER.
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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |