Patent US1622643A successfully refreshed from Google Patents.
US1622643A
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Centrifugal dust separator
Assignee: Centrifix Corp
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Filing: 1925-05-04
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Granted: 1927-03-29
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Expires: 1945-05-04
Abstract
No abstract record available.
Inventors
- 👤 Hawley Charles Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:31
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/10; F27B1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-03-28 | 1930-09-27 | 1931-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-03-28 | 1934-09-27 | 1935-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-03-28 | 1938-09-27 | 1939-03-29 | $7700.00 | Window Closed / Lapsed |