US2951544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for a helicopter
Assignee: Kaman Aircraft Corp
•
Filing: 1957-01-22
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Granted: 1960-09-06
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Charles H Kaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/46; B64C27/54; B64C27/58; B64C27/59; B64C27/615; Y; Y02; Y02T; Y02T50/00; Y02T50/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |