Patent US2787844A successfully refreshed from Google Patents.
US2787844A
Expired / Lapsed
US
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Ditch cleaning implement
Assignee: KENNETH R STEWART
•
Filing: 1954-05-10
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Granted: 1957-04-09
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Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Lloyd K Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:46
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/10; E02F3/087
Claims Analysis
Total Claims: 0
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US2697609A
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US2651123A
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US2681517A
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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) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |