US2625997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter stabilizing device
Assignee: Doak Aircraft Co Inc
•
Filing: 1946-11-01
•
Granted: 1953-01-20
•
Expires: 1966-11-01
Abstract
No abstract record available.
Inventors
- 👤 Edmond R Doak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:09
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1334707A
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US2076520A
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US2058500A
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US2148921A
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US2385028A
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US2369049A
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US2456485A
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US2429665A
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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) | 1956-01-20 | 1956-07-21 | 1957-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-20 | 1960-07-21 | 1961-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-20 | 1964-07-21 | 1965-01-20 | $7700.00 | Window Closed / Lapsed |