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Patent US2650441A successfully refreshed from Google Patents.
US2650441A
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Land leveling machine
Assignee: Individual
•
Filing: 1948-06-07
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Granted: 1953-09-01
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Expires: 1968-06-07
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:01
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1765910A
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US2124625A
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US2277889A
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US2283744A
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US2314888A
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US2407780A
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US2428857A
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USRE23190E
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US2459591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |