US2916832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter trainer mounted on float
Assignee: Boelkow Entwicklungen KG
•
Filing: 1956-11-05
•
Granted: 1959-12-15
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Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Hofmann Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:07
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1825363A
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US2319115A
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US2373653A
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US2493482A
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US2524238A
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US2711594A
Cited
FR1106756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |