US2957526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive means for helicopter rotary blade systems
Assignee: Boelkow Entwicklungen KG
•
Filing: 1956-07-09
•
Granted: 1960-10-25
•
Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 Derschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:49
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2120168A
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US2368698A
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US2364496A
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US2614639A
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US2627928A
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US2611441A
Cited
US2684122A
Cited
US2776718A
Cited
FR1084706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |