US2805830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular lift-producing wing
Assignee: Individual
•
Filing: 1952-12-11
•
Granted: 1957-09-10
•
Expires: 1972-12-11
Abstract
No abstract record available.
Inventors
- 👤 Helmut P G A R Von Zborowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:53
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0091
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1084099A
Cited
US1112615A
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GB154457A
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US1529988A
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US1542547A
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US1744889A
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US1944990A
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US2090038A
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US2207724A
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US2378528A
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US2392443A
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US2318909A
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US2329133A
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US2384721A
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US2465007A
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US2478830A
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US2613496A
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US2476678A
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US2589945A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |