Patent US2838987A successfully refreshed from Google Patents.
US2838987A
Expired / Lapsed
US
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Power lift disc cultivator for tractors
Assignee: Individual
•
Filing: 1953-10-12
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Granted: 1958-06-17
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Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Ollie L Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:15
CPC Classifications
A; A01; A01B; A01B21/00; A01B21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US845902A
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US944415A
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US1023704A
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US1846489A
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US2140144A
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US2431959A
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US2588872A
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US2512114A
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FR986380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |