US2470602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tandem wing aircraft
Assignee: Blackburn Aircraft Ltd
•
Filing: 1945-10-16
•
Granted: 1949-05-17
•
Expires: 1965-10-16
Abstract
No abstract record available.
Inventors
- 👤 Campbell Thomas Coehrane
- 👤 Hall Eric Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:23
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE474955C
Cited
US1869871A
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US2003206A
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FR789619A
Cited
US2112755A
Cited
FR803976A
Cited
US2156994A
Cited
US2271226A
Cited
US2406625A
Cited
US2421694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |