US2743071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter automatic flight control
Assignee: Bell Aircraft Corp
•
Filing: 1952-12-02
•
Granted: 1956-04-24
•
Expires: 1972-12-02
Abstract
No abstract record available.
Inventors
- 👤 Kelley Bartram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:31
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR706796A
Cited
US2092424A
Cited
FR838413A
Cited
FR880122A
Cited
US2432348A
Cited
US2555577A
Cited
US2629452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |