Patent US2458896A successfully refreshed from Google Patents.
US2458896A
Expired / Lapsed
US
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Differential balance for airfoils
Assignee: Curtiss Wright Corp
•
Filing: 1942-08-10
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Granted: 1949-01-11
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Expires: 1962-08-10
Abstract
No abstract record available.
Inventors
- 👤 Robert A Darby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1710672A
Cited
DE645657C
Cited
US2152033A
Cited
US2211870A
Cited
GB491538A
Cited
US2238403A
Cited
DE693900C
Cited
US2361275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |