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Patent US2620147A successfully refreshed from Google Patents.
US2620147A
Expired / Lapsed
US
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Airplane flap control mechanism
Assignee: Boeing Co
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Filing: 1950-05-31
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Granted: 1952-12-02
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Expires: 1970-05-31
Abstract
No abstract record available.
Inventors
- 👤 Van B Butler
- 👤 Jr William H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:26
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/14; B64C9/16; B64C9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |