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Patent US2650046A successfully refreshed from Google Patents.
US2650046A
Expired / Lapsed
US
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Automatic control for helicopters
Assignee: Boeing Helicopters Co
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Filing: 1950-12-14
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Granted: 1953-08-25
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Expires: 1970-12-14
Abstract
No abstract record available.
Inventors
- 👤 Edward G Vanderlip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/08; G05D1/0808; G05D1/0858
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1919089A
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US1993414A
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US2023105A
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US2433344A
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US2479549A
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US2459268A
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US2427939A
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US2529479A
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US2517150A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |