Patent US2618871A successfully refreshed from Google Patents.
US2618871A
Expired / Lapsed
US
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Stump lifter attachment for tractors
Assignee: Individual
•
Filing: 1950-08-23
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Granted: 1952-11-25
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Expires: 1970-08-23
Abstract
No abstract record available.
Inventors
- 👤 Alvis W Craver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
A; A01; A01G; A01G23/00; A01G23/02; A01G23/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1910481A
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US2386187A
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US2302801A
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US2474037A
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US2508284A
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US2535054A
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US2535099A
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US2505923A
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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) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |