US2470411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing a silicamagnesia gel catalyst
Assignee: Standard Oil Development Co
•
Filing: 1946-08-21
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Granted: 1949-05-17
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Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Eugene S Corner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1900859A
Cited
US2343731A
Cited
US2340934A
Cited
US2343295A
Cited
US2390556A
Cited
US2412958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |