US2767538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leveling mechanism for rigid frame disk harrows
Assignee: HORACE D HUME
•
Filing: 1951-04-09
•
Granted: 1956-10-23
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Expires: 1971-04-09
Abstract
No abstract record available.
Inventors
- 👤 Earl L Scheidenhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/14; A01B63/16; A01B63/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1653677A
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US2320742A
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US2349257A
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US2458091A
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US2580100A
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US2608145A
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US2623341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |