US2825514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined airplane-helicopter flying machine
Assignee: MINISTERIO DA AERONAUTICA
•
Filing: 1954-02-19
•
Granted: 1958-03-04
•
Expires: 1974-02-19
Abstract
No abstract record available.
Inventors
- 👤 Focke Henrich Carl Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:41
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1470275A
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US1817651A
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US2023334A
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US1846992A
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US2143317A
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US2193448A
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US2379355A
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FR914954A
Cited
GB666491A
Cited
US2621001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |