Patent US2449847A successfully refreshed from Google Patents.
US2449847A
Expired / Lapsed
US
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Manufacturing alumina gel from amalgamated aluminum
Assignee: Standard Oil Co
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Filing: 1945-02-21
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Granted: 1948-09-21
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Expires: 1965-02-21
Abstract
No abstract record available.
Inventors
- 👤 Heard Llewellyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:24
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J13/00; B01J13/0004; C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/428; C01P; C01P2006/00; C01P2006/10
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) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |