Patent US2874391A successfully refreshed from Google Patents.
US2874391A
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US
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Hydraulically operated retractible running gear for boats
Assignee: LONZY M MARTIN
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Filing: 1956-02-03
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Granted: 1959-02-24
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Expires: 1976-02-03
Abstract
No abstract record available.
Inventors
- 👤 Charles C Renfroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:27
CPC Classifications
B; B63; B63C; B63C13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2050481A
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US2376576A
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US2570528A
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US2501750A
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GB649243A
Cited
US2662236A
Cited
US2692097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |