US3667921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flux growth of rare earth fluorides
Assignee: AT&T Inc
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Filing: 1969-08-07
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Granted: 1972-06-06
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Expires: 1989-08-07
Abstract
Abstract RARE EARTH FLUORIDES ARE GROWN FROM A LIQUID PHASE WHICH INCLUDES A FLUX INGREDIENT SUCH AS BERYLLIUM FLUORIDE. IMPROVED EFFECTIVENESS OF THE PRODUCT AS AND UP-CONVERTING PHOSPHOR IS ATTRIBUTABLE IN PART TO THE GETTERING ACTION OF THE FLUX INGREDIENT FOR OXYGEN.
Inventors
- 👤 William H Grodkiewicz
- 👤 Le Grand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7704; C09K11/7705; C30; C30B; C30B29/00; C30B29/10; C30B29/12; C30B9/00
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |