US2933266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular wing flying machines
Assignee: Individual
•
Filing: 1956-02-07
•
Granted: 1960-04-19
•
Expires: 1976-02-07
Abstract
No abstract record available.
Inventors
- 👤 Helmut Ph G A R Von Zborowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:41
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/06; B64C39/062; B64C29/00; B64C29/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1440242A
Cited
US1686080A
Cited
DE726969C
Cited
US2566319A
Cited
FR945470A
Cited
US2590009A
Cited
US2776622A
Cited
US2787218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |