Patent US2457566A successfully refreshed from Google Patents.
US2457566A
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Regeneration of alumina adsorbents by oxidation
Assignee: Porocel Industries LLC
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Filing: 1945-07-07
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Granted: 1948-12-28
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Expires: 1965-07-07
Abstract
No abstract record available.
Inventors
- 👤 Knut A Krieger
- 👤 Heinemann Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:01
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3433; B01J20/02; B01J20/06; B01J20/08; B01J20/345; B01J20/3458; B01J20/3466
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) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |