US2443393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter with one or more rotors having controllable ailerons
Assignee: Individual
•
Filing: 1942-12-08
•
Granted: 1948-06-15
•
Expires: 1962-12-08
Abstract
No abstract record available.
Inventors
- 👤 Landgraf Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:51
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5124; Y10T29/5127; Y10T29/5134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR846646A
Cited
US327741A
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US1015090A
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US1083084A
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US1449129A
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US1526230A
Cited
FR560303A
Cited
US1836406A
Cited
US1917965A
Cited
US1957813A
Cited
US1910622A
Cited
US1977724A
Cited
US2295172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-15 | 1951-12-15 | 1952-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-15 | 1955-12-15 | 1956-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-15 | 1959-12-15 | 1960-06-15 | $7700.00 | Window Closed / Lapsed |