US2449622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple stage regeneration of spent catalysts
Assignee: Standard Oil Development Co
•
Filing: 1943-05-15
•
Granted: 1948-09-21
•
Expires: 1963-05-15
Abstract
No abstract record available.
Inventors
- 👤 Bruno E Roetheli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1984380A
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US2273076A
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US2419245A
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US2378342A
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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 |