US2468559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-propelled airplane
Assignee: Individual
•
Filing: 1944-10-26
•
Granted: 1949-04-26
•
Expires: 1964-10-26
Abstract
No abstract record available.
Inventors
- 👤 Ray W Kangas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:26
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1420509A
Cited
US1106193A
Cited
US1153143A
Cited
US1346993A
Cited
US1697770A
Cited
US2118052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |