US2451471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a co-precipitated gel catalyst
Assignee: Standard Oil Co
•
Filing: 1942-01-20
•
Granted: 1948-10-19
•
Expires: 1962-01-20
Abstract
No abstract record available.
Inventors
- 👤 Robert E Burk
- 👤 Everett C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2236514A
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US2280060A
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US2280650A
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US2285396A
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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) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |