US2509367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft having rotating blades or wings
Assignee: Kellett Aircraft Corp
•
Filing: 1944-11-03
•
Granted: 1950-05-30
•
Expires: 1964-11-03
Abstract
No abstract record available.
Inventors
- 👤 Richard H Prewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:35
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1987650A
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US2076090A
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US2080540A
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FR844908A
Cited
US2183119A
Cited
US2263304A
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US2324588A
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US2365357A
Cited
US2375465A
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US2393158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |