US2920587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual disk furrow opener
Assignee: Deere and Co
•
Filing: 1956-12-12
•
Granted: 1960-01-12
•
Expires: 1976-12-12
Abstract
No abstract record available.
Inventors
- 👤 George H Shriver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:26
CPC Classifications
A; A01; A01C; A01C5/00; A01C5/06; A01C5/062; A01C5/064
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US358247A
Cited
US615727A
Cited
US745197A
Cited
US736369A
Cited
US1104725A
Cited
US1254266A
Cited
US2106901A
Cited
US2159652A
Cited
US2341143A
Cited
US2341795A
Cited
US2611331A
Cited
US2713836A
Cited
US2769412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |