Patent US3186491A successfully refreshed from Google Patents.
US3186491A
Expired / Lapsed
US
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Helicopter drive system utilizing tip mounted fans
Assignee: General Electric Co
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Filing: 1964-03-17
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Granted: 1965-06-01
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Expires: 1984-03-17
Abstract
No abstract record available.
Inventors
- 👤 Fischer Lee Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:47
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2474359A
Cited
US2984304A
Cited
GB793823A
Cited
US2941600A
Cited
US2917895A
Cited
GB883819A
Cited
GB938459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |