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US2477751A
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Apparatus for suspended catalyst operations
Assignee: Standard Oil Co
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Filing: 1945-06-29
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Granted: 1949-08-02
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Expires: 1965-06-29
Abstract
No abstract record available.
Inventors
- 👤 Everett A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:42
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1845; B01J8/1854; B01J8/24; B01J8/26; B01J8/38; B01J8/384; B01J8/386
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) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |