Patent US2644390A successfully refreshed from Google Patents.
US2644390A
Expired / Lapsed
US
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Reversible-flow window fan
Assignee: Individual
•
Filing: 1950-01-05
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Granted: 1953-07-07
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Expires: 1970-01-05
Abstract
No abstract record available.
Inventors
- 👤 George A Delf
- 👤 Cour Creve
- 👤 Glenn A Delf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2008965A
Cited
US1935179A
Cited
US1929688A
Cited
US1917327A
Cited
US2126499A
Cited
FR820521A
Cited
US2452950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |