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US2638181A
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Mechanism for separating air-borne materials
Assignee: FARM PRODUCTION ENGINEERS Inc
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Filing: 1949-05-31
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Granted: 1953-05-12
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Expires: 1969-05-31
Abstract
No abstract record available.
Inventors
- 👤 Elwin V Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/12; B04C5/13; B04C2005/133; Y; Y10; Y10S; Y10S55/00; Y10S55/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US387617A
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US458733A
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DE460336C
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US1122371A
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US1383984A
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US1719119A
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US1922316A
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GB362723A
Cited
US1917310A
Cited
US2437592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |