US3477796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor construction
Assignee: Bolkow GmbH
•
Filing: 1968-07-23
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Granted: 1969-11-11
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Expires: 1988-07-23
Abstract
No abstract record available.
Inventors
- 👤 Emil Weiland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:13
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/45; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2588570A
Cited
US2484141A
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US2659444A
Cited
US3000446A
Cited
FR1334446A
Cited
US3237697A
Cited
US3321019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |