US2611344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor
Assignee: Boeing Helicopters Co
•
Filing: 1946-06-06
•
Granted: 1952-09-23
•
Expires: 1966-06-06
Abstract
No abstract record available.
Inventors
- 👤 Edward G Vanderlip
- 👤 Daland Elliot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1454944A
Cited
US1449129A
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FR560303A
Cited
US2095734A
Cited
US1986709A
Cited
US2162794A
Cited
FR851766A
Cited
US2308802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |