US2652641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ditching knife for wheel-type ditch diggers
Assignee: Individual
•
Filing: 1948-04-02
•
Granted: 1953-09-22
•
Expires: 1968-04-02
Abstract
No abstract record available.
Inventors
- 👤 Frank W Zowaski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/18; E02F3/181
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US338678A
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US1978732A
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US711992A
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US822395A
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US877345A
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US1156291A
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US1398195A
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US1638099A
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US2328715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |