Patent US2987336A successfully refreshed from Google Patents.
Patent US3408745A successfully refreshed from Google Patents.
US3408745A
Expired / Lapsed
US
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Methods of and means for producing anhydrous alumina
Assignee: Rio Tinto Switzerland AG
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Filing: 1966-08-23
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Granted: 1968-11-05
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Expires: 1986-08-23
Abstract
No abstract record available.
Inventors
- 👤 Filippi Luigi
- 👤 Dinner Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:49
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/44; C01F7/441; C01F7/444; F; F26; F26B; F26B17/00; F26B17/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |