Patent US2238844A successfully refreshed from Google Patents.
US2238844A
Expired / Lapsed
US
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Retractable rudder
Assignee: Focke Wulf Flugzeugbau GmbH
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Filing: 1939-06-29
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Granted: 1941-04-15
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Expires: 1959-06-29
Abstract
No abstract record available.
Inventors
- 👤 Arbeitlang Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:15
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/38; B63H25/382; B63H2025/384; B63H2025/385
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-14 | 1944-10-14 | 1945-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-14 | 1948-10-14 | 1949-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-14 | 1952-10-14 | 1953-04-15 | $7700.00 | Window Closed / Lapsed |