Patent US2669919A successfully refreshed from Google Patents.
US2669919A
Expired / Lapsed
US
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Rotary plow
Assignee: Individual
•
Filing: 1951-08-24
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Granted: 1954-02-23
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Expires: 1971-08-24
Abstract
No abstract record available.
Inventors
- 👤 Leon T Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:01
CPC Classifications
A; A01; A01B; A01B33/00; A01B33/02; A01B33/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US154489A
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US988030A
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US1085508A
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US1676646A
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US2214702A
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US2283744A
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US2465488A
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US2558822A
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GB597850A
Cited
US2424014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |