Patent US2994384A successfully refreshed from Google Patents.
US2994384A
Expired / Lapsed
US
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Helicopter with jet driven rotor
Assignee: Kaman Aircraft Corp
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Filing: 1957-12-09
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Granted: 1961-08-01
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Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Martin L Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:13
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23448E
Cited
GB412487A
Cited
US2650666A
Cited
US2818223A
Cited
GB632065A
Cited
US2689615A
Cited
GB756050A
Cited
US2814349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |