US2489309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of an iron-freed acid treated kaolin catalyst
Assignee: Houdry Process Corp
•
Filing: 1946-04-30
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Granted: 1949-11-29
•
Expires: 1966-04-30
Abstract
No abstract record available.
Inventors
- 👤 Mills George Alexander
- 👤 Edward B Cornelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:13
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1133446A
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US1162130A
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US1570353A
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US1953144A
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US2088281A
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US2326706A
Cited
US2320799A
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US2374313A
Cited
US2402668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |