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US2734493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable and reversible pitch fan for
Assignee: —
•
Filing: —
•
Granted: 1956-02-14
•
Expires: 1973-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/06; F01P5/00; F01P5/10; F01P5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2047028A
Cited
US2284938A
Cited
US2437810A
Cited
US2423140A
Cited
FR942363A
Cited
US2479668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-13 | 1959-08-15 | 1960-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-13 | 1963-08-15 | 1964-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-13 | 1967-08-15 | 1968-02-14 | $7700.00 | Window Closed / Lapsed |