US2427982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter antitorque and steering control
Assignee: Bell Aircraft Corp
•
Filing: 1947-06-19
•
Granted: 1947-09-23
•
Expires: 1967-06-19
Abstract
No abstract record available.
Inventors
- 👤 John C Trotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:34
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1472148A
Cited
US1971734A
Cited
US1980999A
Cited
US2190812A
Cited
US2317340A
Cited
US2318259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |