Patent US2805830A successfully refreshed from Google Patents.
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 05:00
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0091
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1084099A
Cited
US1112615A
Cited
GB154457A
Cited
US1529988A
Cited
US1542547A
Cited
US1744889A
Cited
US1944990A
Cited
US2090038A
Cited
US2207724A
Cited
US2378528A
Cited
US2392443A
Cited
US2318909A
Cited
US2329133A
Cited
US2384721A
Cited
US2465007A
Cited
US2478830A
Cited
US2613496A
Cited
US2476678A
Cited
US2589945A
Cited
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 |