US2983319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Harmonic anti-vibration means for a helicopter
Assignee: Kaman Aircraft Corp
•
Filing: 1956-03-01
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Granted: 1961-05-09
•
Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Kaman Charles
- 👤 Martin L Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2514749A
Cited
US2521012A
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US2620888A
Cited
US2652898A
Cited
US2695674A
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GB715119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |