Patent US2373969A successfully refreshed from Google Patents.
US2373969A
Expired / Lapsed
US
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Combined centrifugal fan and dust collector
Assignee: BF Sturtevant Co
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Filing: 1943-03-05
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Granted: 1945-04-17
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Expires: 1963-03-05
Abstract
No abstract record available.
Inventors
- 👤 Roland L Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:51
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D17/00; F04D17/08; F04D17/16; F04D17/162
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) | 1948-04-16 | 1948-10-16 | 1949-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-16 | 1952-10-16 | 1953-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-16 | 1956-10-16 | 1957-04-17 | $7700.00 | Window Closed / Lapsed |