US3007530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor head
Assignee: Doman Helicopters Inc
•
Filing: 1958-07-29
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Granted: 1961-11-07
•
Expires: 1978-07-29
Abstract
No abstract record available.
Inventors
- 👤 Glidden S Doman
- 👤 Michael C Frengley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:45
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605
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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |