Patent US4811870A successfully refreshed from Google Patents.
US2579651A
Expired / Lapsed
US
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V-type ditcher
Assignee: Individual
•
Filing: 1947-04-29
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Granted: 1951-12-25
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Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Anthony R Coviello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:48
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |