Patent US3657141A successfully refreshed from Google Patents.
US3657141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Europium-samarium coactivated strontium fluoroborate phosphor
Assignee: GTE Sylvania Inc
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Filing: 1970-08-12
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Granted: 1972-04-18
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Expires: 1990-08-12
Abstract
Abstract A STRONTIUM FLUOROBORATE PHOSPHOR COACTIVATED BY EUROPIUM AND SAMARIUM IS DISCLOSED WHEREIN THE PHOSPHOR CAN BE CHARACTERIZED AS FOLLOWS: SRWFXFYOZ:EUUSMV WHEREIN W IS FROM ABOUT 0.90 TO ABOUT 0.99, X IS FROM ABOUT 0.50 TO ABOUT 1.00 Y IS FROM ABOUT 3.00 TO ABOUT 4.5, Z IS FROM ABOUT 5.00 TO ABOUT 7.45, U IS FROM ABOUT 0.005 TO ABOUT 0.05, AND V IS FROM ABOUT 0.005 TO ABOUT 0.10. THE PHOSPHOR IS USEFUL IN LOW-PRESSURE OR HIGHPRESSURE ELECTRIC DISCHARGE DEVICES.
Inventors
- 👤 Charles F Chenot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:36
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7797
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |