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Patent US2609883A successfully refreshed from Google Patents.
US2609883A
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US
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Rotary wing blade
Assignee: Boeing Helicopters Co
•
Filing: 1946-11-29
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Granted: 1952-09-09
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Expires: 1966-11-29
Abstract
No abstract record available.
Inventors
- 👤 Daland Elliot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1031; Y10T156/1052; Y10T156/1056; Y10T156/1057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1428714A
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US2070657A
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US2152861A
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US2111975A
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US2303707A
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US2272439A
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US2305247A
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US2343383A
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US2388485A
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US2412908A
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US2467031A
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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) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |