Patent US2469619A successfully refreshed from Google Patents.
US2469619A
Expired / Lapsed
US
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Aircraft whose lift is increased by power means
Assignee: Individual
•
Filing: 1943-11-17
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Granted: 1949-05-10
•
Expires: 1963-11-17
Abstract
No abstract record available.
Inventors
- 👤 Douglas K Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:52
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1085932A
Cited
FR424373A
Cited
US1060273A
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US1045209A
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US1200512A
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US1353544A
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US1479901A
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GB338043A
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US1876096A
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US1855652A
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GB398069A
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US2081436A
Cited
US2194596A
Cited
US2271226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |