Patent US2944632A successfully refreshed from Google Patents.
US2944632A
Expired / Lapsed
US
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Centrifugal dust collector
Assignee: Individual
•
Filing: 1956-09-11
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Granted: 1960-07-12
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Expires: 1976-09-11
Abstract
No abstract record available.
Inventors
- 👤 Charles H Whitmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:17
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B01D45/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR711371A
Cited
DE573905C
Cited
DE570855C
Cited
GB514320A
Cited
US2459944A
Cited
US2591396A
Cited
US2453593A
Cited
US2482642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |