US2440756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing catalyst
Assignee: Filtrol Corp
•
Filing: 1944-10-13
•
Granted: 1948-05-04
•
Expires: 1964-10-13
Abstract
No abstract record available.
Inventors
- 👤 Oulton Thomas Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:39
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1933067A
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US2141185A
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GB490853A
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US2330685A
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US2139026A
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US2265682A
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US2229361A
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US2320799A
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US2398899A
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US2391312A
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US2388735A
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US2397505A
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US2400020A
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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 |