Patent US2807428A successfully refreshed from Google Patents.
US2807428A
Expired / Lapsed
US
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Aircraft with enclosed rotor
Assignee: VIBRANE Corp
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Filing: 1953-07-15
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Granted: 1957-09-24
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Expires: 1973-07-15
Abstract
No abstract record available.
Inventors
- 👤 Wibault Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:25
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0025; B64C39/00; B64C39/001; B64C39/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1021116A
Cited
FR543399A
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US1660257A
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US1724226A
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US1908212A
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US2008464A
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US2077471A
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US2468787A
Cited
US2485502A
Cited
US2567392A
Cited
US2670049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |