Patent EP0514547A1 successfully refreshed from Google Patents.
US3395876A
Expired / Lapsed
US
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Aircraft with housed counter rotating propellors
Assignee: JACOB B GREEN
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Filing: 1966-05-05
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Granted: 1968-08-06
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Expires: 1986-05-05
Abstract
No abstract record available.
Inventors
- 👤 Jacob B Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:27
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)
US2473331A
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US2777649A
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US2863621A
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US2978205A
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US3135481A
Cited
FR1347733A
Cited
US3312425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |