Patent US3759835A successfully refreshed from Google Patents.
US3759835A
Expired / Lapsed
US
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Process for producing rare earth oxide phosphors
Assignee: GTE Sylvania Inc
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Filing: 1971-03-22
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Granted: 1973-09-18
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Expires: 1991-03-22
Abstract
Abstract A PROCESS FOR PRODUCING RARE-EARTH OXIDE PHOSPHORS IS DISCLOSED WHEREIN SPECIFIED AMOUNTS OF YTTRIUM OXIDE, GADOLINIUM, OR MIXTURES THEREOF ARE BLENDED WITH EUROPIUM OXIDE AND A HEAT DECOMPOSABLE BORATE SOURCE AND HEATED TO A CERTAIN TEMPERATURE FOR A PREDETERMINED LENGTH OF TIME. THE MATERIAL IS THEN REBLENDED WITH A SPECIFIED AMOUNT OF A HEAT DECOMPOSABLE LITHIUM SOURCE AND HEATED TO A CERTAIN TEMPERATURE FOR A PREDETERMINED LENGTH OF TIME.
Inventors
- 👤 E Mehalchick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |