US2952422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular wing aircraft
Assignee: FLETCH AIRE Co Inc
•
Filing: 1955-08-03
•
Granted: 1960-09-13
•
Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Charles J Fletcher
- 👤 Raymond A Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:12
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/02; B64C39/00; B64C39/06; B64C39/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US936116A
Cited
US1655114A
Cited
US1686080A
Cited
US1720939A
Cited
US2753005A
Cited
FR1050948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |