Patent US2981012A successfully refreshed from Google Patents.
US2981012A
Expired / Lapsed
US
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Mobile ditching machine
Assignee: Cleveland Trencher Co
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Filing: 1959-05-28
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Granted: 1961-04-25
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Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Henry L Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:25
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1246537A
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US1287675A
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US1762568A
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US1652126A
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US2372397A
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US2648145A
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US2783556A
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US2811231A
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US2805079A
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US2923171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |