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Patent US2435401A successfully refreshed from Google Patents.
US2435401A
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Auxiliary propeller drive
Assignee: Individual
•
Filing: 1942-04-24
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Granted: 1948-02-03
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Expires: 1962-04-24
Abstract
No abstract record available.
Inventors
- 👤 Robert P Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:36
CPC Classifications
B; B64; B64C; B64C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1245902A
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GB165310A
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US1908726A
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US1773340A
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US1845950A
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US1886327A
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US2077708A
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US2164545A
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US2252528A
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US2160281A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-02 | 1951-08-04 | 1952-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-02 | 1955-08-04 | 1956-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-02 | 1959-08-04 | 1960-02-03 | $7700.00 | Window Closed / Lapsed |