Patent US2885800A successfully refreshed from Google Patents.
US2885800A
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Ditching machine
Assignee: NAT RES DEV
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Filing: 1954-07-12
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Granted: 1959-05-12
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Hawkins John Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:28
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/18; E02F3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |