Patent US3539291A successfully refreshed from Google Patents.
US3539291A
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US
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Preparation of starting materials for phosphate phosphors
Assignee: GTE Sylvania Inc
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Filing: 1967-12-06
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Granted: 1970-11-10
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Expires: 1987-12-06
Abstract
No abstract record available.
Inventors
- 👤 Vincent Chiola
- 👤 Clarence D Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/327
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2021527A
Cited
US3245777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |