US2454941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying hydrogel catalysts by distilling with butanol
Assignee: Standard Oil Development Co
•
Filing: 1944-02-25
•
Granted: 1948-11-30
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Expires: 1964-02-25
Abstract
No abstract record available.
Inventors
- 👤 Jerry A Pierce
- 👤 Jr Charles N Kimberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:37
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; B01J20/00; B01J20/02; B01J20/06; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB222279A
Cited
US1712830A
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US1755496A
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US1843576A
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US1989541A
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US2138048A
Cited
US2152716A
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US2249767A
Cited
US2272301A
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US2282303A
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US2360186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |