US2440743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Promoted acid treated clay catalyst and preparation thereof
Assignee: Filtrol Corp
•
Filing: 1943-07-03
•
Granted: 1948-05-04
•
Expires: 1963-07-03
Abstract
No abstract record available.
Inventors
- 👤 Wright W Gary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; B01J23/00; B01J23/16; B01J23/32; B01J23/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1696644A
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US1797426A
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US1837971A
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US2078945A
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US2330098A
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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) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |