Patent US2623712A successfully refreshed from Google Patents.
US2623712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airplane with pivotally mounted sustaining wing
Assignee: Individual
•
Filing: 1946-09-21
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Granted: 1952-12-30
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Expires: 1966-09-21
Abstract
No abstract record available.
Inventors
- 👤 George G Spratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:10
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/38; B64C3/385
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE414120C
Cited
FR396821A
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FR10257E
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US1849652A
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US1915809A
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US1906005A
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US1931809A
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US2104006A
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US2128060A
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US2160089A
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US2428194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |