Patent US3991361A successfully refreshed from Google Patents.
US2953320A
Expired / Lapsed
US
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Aircraft with ducted lifting fan
Assignee: Individual
•
Filing: 1955-07-18
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Granted: 1960-09-20
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Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 Robert D Parry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/06; B64C27/00; B64C27/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR394969A
Cited
US1822386A
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US2468787A
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US2377835A
Cited
US2547266A
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US2730311A
Cited
US2801058A
Cited
FR1036163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |