US2447181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica-magnesia catalyst and preparation thereof
Assignee: Rohm and Haas Co
•
Filing: 1946-05-31
•
Granted: 1948-08-17
•
Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Darrel J Butterbaugh
- 👤 Le Roy U Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:06
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; B; B01; B01J; B01J21/00; B01J21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2088281A
Cited
US2343731A
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US2341193A
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US2390556A
Cited
US2340698A
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US2350282A
Cited
US2399261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |