US2648387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor head
Assignee: Doman Helicopters Inc
•
Filing: 1946-06-27
•
Granted: 1953-08-11
•
Expires: 1966-06-27
Abstract
No abstract record available.
Inventors
- 👤 Glidden S Doman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:33
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1986709A
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US2037745A
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FR794520A
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US2216164A
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GB480747A
Cited
DE671693C
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US2163893A
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US2205835A
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US2256918A
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US2256635A
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US2444070A
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US2440225A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |