Patent US2593880A successfully refreshed from Google Patents.
US2593880A
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Portable earth leveling apparatus
Assignee: Individual
•
Filing: 1947-09-10
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Granted: 1952-04-22
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Expires: 1967-09-10
Abstract
No abstract record available.
Inventors
- 👤 Oral R Heavilin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663; A; A01; A01B; A01B31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2160193A
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US2045166A
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US2124625A
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US2146807A
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US2096656A
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US2411277A
Cited
US2407780A
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US2444977A
Cited
US2428857A
Cited
US2459591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |