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US3794597A
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US
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Method of increasing brightness of y2o2s:eu luminescent material
Assignee: GTE Sylvania Inc
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Filing: 1972-06-07
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Granted: 1974-02-26
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Expires: 1992-06-07
Abstract
Abstract BRIGHTENESS OF Y2O2S:EU CAN BE INCREASED, COLOR PURITY IMPROVED AND LESSER AMOUNTS OF EU ACTIVATOR CAN BE USED, IF THE RAW MATERIALS CONTAIN ABOUT 200 P.PM. HG+2 DURING THE FABRICATION PROCESS.
Inventors
- 👤 E Mehalchick
- 👤 J Mathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:54
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |