Patent US3027986A successfully refreshed from Google Patents.
US3027986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch mechanism for a helicopter
Assignee: Kaman Aircraft Corp
•
Filing: 1953-09-09
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Granted: 1962-04-03
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Expires: 1973-09-09
Abstract
No abstract record available.
Inventors
- 👤 Nelson R Richmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
F; F16; F16D; F16D25/00; B; B64; B64C; B64C27/00; B64C27/04; B64C27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB689694A
Cited
GB250309A
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GB390420A
Cited
US2210416A
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US2428128A
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US2495988A
Cited
US2530904A
Cited
US2587823A
Cited
US2620814A
Cited
US2646150A
Cited
US2644535A
Cited
US2695693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |