US2437732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for propelling and increasing the lift of airplanes
Assignee: FERREL IND Inc
•
Filing: 1943-01-12
•
Granted: 1948-03-16
•
Expires: 1963-01-12
Abstract
No abstract record available.
Inventors
- 👤 Clyde B Ferrel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:04
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191129364A
Cited
US1611353A
Cited
US1854043A
Cited
US1879717A
Cited
GB348293A
Cited
US1918897A
Cited
US1973835A
Cited
US2041790A
Cited
US2176904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |