Patent US2353773A successfully refreshed from Google Patents.
US2353773A
Expired / Lapsed
US
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Controllable pitch propeller
Assignee: Individual
•
Filing: 1943-02-20
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Granted: 1944-07-18
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Expires: 1963-02-20
Abstract
No abstract record available.
Inventors
- 👤 Unterberg Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:36
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34; B64C11/346; B64D; B64D7/00; B64D7/02
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) | 1947-07-18 | 1948-01-17 | 1948-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-18 | 1952-01-17 | 1952-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-18 | 1956-01-17 | 1956-07-18 | $7700.00 | Window Closed / Lapsed |