Patent US2807586A successfully refreshed from Google Patents.
US2807586A
Expired / Lapsed
US
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Lead activated calcium tungstate phosphor containing small amounts of sodium and lithium
Assignee: GTE Sylvania Inc
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Filing: 1950-04-28
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Granted: 1957-09-24
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Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/68
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
A LEAD-ACTIVATED CALCIUM MAGNESIUM TUNGSTATE PHOSPHOR CONTAINING IN THE AMOUNT SPECIFIED A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ABOUT 0.03% SODIUM AND 0.01% LITHIUM, CALCULATED AS THE RESPECTIVE CARBONATE, BY WEIGHT OF THE EQUIVALENT AMOUNT OF CALCIUM CARBONATE CORRESPONDING TO THE AMOUNT OF CALCIUM IN THE MIXTURE THE SUBSTANCE SELECTED BEING CHEMICALLY COMBINED WITH THE PHOSPHOR.
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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |