US3533714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade construction
Assignee: Bolkow GmbH
•
Filing: 1968-07-23
•
Granted: 1970-10-13
•
Expires: 1988-07-23
Abstract
No abstract record available.
Inventors
- 👤 Kurt Pfleiderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:50
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/001; B64C27/32; B64C27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2076090A
Cited
US2404678A
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US2588570A
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US2484141A
Cited
US2630868A
Cited
DE1036064B
Cited
FR1334446A
Cited
US3402772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |