Patent US2643868A successfully refreshed from Google Patents.
US2643868A
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Depth control means for scarifiers
Assignee: Individual
•
Filing: 1950-05-04
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Granted: 1953-06-30
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Expires: 1970-05-04
Abstract
No abstract record available.
Inventors
- 👤 Carl B Covington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:25
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/114; E; E02; E02F; E02F5/00; E02F5/30; E02F5/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1438146A
Cited
US1829953A
Cited
US1994817A
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US2012853A
Cited
US2045461A
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US2330283A
Cited
US2488016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |