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US3002569A
Expired / Lapsed
US
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Locking device for floating hub helicopter rotors
Assignee: McDonnell Aircraft Corp
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Filing: 1959-05-28
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Granted: 1961-10-03
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Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Friedrich L Doblhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:37
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/322; B64C27/37; B64C27/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |