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US2470056A
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Rotor blade
Assignee: Bell Aircraft Corp
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Filing: 1946-10-23
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Granted: 1949-05-10
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Expires: 1966-10-23
Abstract
No abstract record available.
Inventors
- 👤 Charles M Seibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:53
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB132849A
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US2152861A
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US2056592A
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US2303707A
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US2312219A
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US2420174A
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US2414125A
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US2426121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |