Patent US2417003A successfully refreshed from Google Patents.
US2417003A
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US
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Changeable pitch airscrew hub
Assignee: Bell Aircraft Corp
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Filing: 1943-09-18
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Granted: 1947-03-04
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Expires: 1963-09-18
Abstract
No abstract record available.
Inventors
- 👤 Donald R Macalpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:39
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494014A
Cited
GB130664A
Cited
US1879659A
Cited
US1871124A
Cited
GB412133A
Cited
GB506374A
Cited
US2243046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-03 | 1950-09-02 | 1951-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-03 | 1954-09-02 | 1955-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-03 | 1958-09-02 | 1959-03-04 | $7700.00 | Window Closed / Lapsed |