Patent US2573764A successfully refreshed from Google Patents.
US2573764A
Expired / Lapsed
US
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Variable pitch propeller
Assignee: Individual
•
Filing: 1947-06-07
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Granted: 1951-11-06
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Expires: 1967-06-07
Abstract
No abstract record available.
Inventors
- 👤 Carl J Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:51
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)
GB190522325A
Cited
US1431382A
Cited
FR726918A
Cited
GB381648A
Cited
US1999091A
Cited
FR771686A
Cited
US2239739A
Cited
US2224640A
Cited
US2378938A
Cited
US2409050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |