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Patent US3488147A successfully refreshed from Google Patents.
US3488147A
Expired / Lapsed
US
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Preparation of alumina by hydrolysis of aluminum
Assignee: Engelhard Industries Inc
•
Filing: 1965-06-01
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Granted: 1970-01-06
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Expires: 1985-06-01
Abstract
No abstract record available.
Inventors
- 👤 Carl D Keith
- 👤 Kurt W Cornely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1196806A
Cited
US2258099A
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US2336597A
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US2590833A
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US2758011A
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US3003952A
Cited
US2915475A
Cited
US3222130A
Cited
US3357791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |