US2663371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for tandem rotor helicopters
Assignee: Individual
•
Filing: 1945-12-17
•
Granted: 1953-12-22
•
Expires: 1965-12-17
Abstract
No abstract record available.
Inventors
- 👤 Gilbert W Magill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:43
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1350932A
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US1783011A
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US1900689A
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US1919089A
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CH155974A
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US1915855A
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FR812893A
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FR48770E
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US2290224A
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US2330842A
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US2256918A
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US2384445A
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US2394846A
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US2414435A
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US2445354A
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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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |