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US3389975A
Expired / Lapsed
US
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Process for the recovery of aluminum values from retorted shale and conversion of sodium aluminate to sodium aluminum carbonate hydroxide
Assignee: Sinclair Research Inc
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Filing: 1967-03-10
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Granted: 1968-06-25
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Expires: 1987-03-10
Abstract
No abstract record available.
Inventors
- 👤 Robert A Van Nordstrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:09
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2783124A
Cited
US2921838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |