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US2806550A
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Dust separators or concentrators of the cyclone type
Assignee: American Air Filter Co Inc
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Filing: 1953-12-09
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Granted: 1957-09-17
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Expires: 1973-12-09
Abstract
No abstract record available.
Inventors
- 👤 Karl L Westlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:48
CPC Classifications
B; B04; B04C; B04C3/00; B04C3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US424157A
Cited
US516371A
Cited
US771691A
Cited
GB190720412A
Cited
FR902476A
Cited
US2647588A
Cited
US2662610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |