US2429665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch propeller
Assignee: Individual
•
Filing: 1944-03-20
•
Granted: 1947-10-28
•
Expires: 1964-03-20
Abstract
No abstract record available.
Inventors
- 👤 Biermann David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34; B64C11/346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB134569A
Cited
GB191500622A
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US1556012A
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US1656019A
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US1786644A
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US1871124A
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US1952799A
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US1886289A
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US2021470A
Cited
US2132133A
Cited
US2219303A
Cited
GB550227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |