US2921638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective load and position control for agricultural tractor
Assignee: Deere and Co
•
Filing: 1955-06-20
•
Granted: 1960-01-19
•
Expires: 1975-06-20
Abstract
No abstract record available.
Inventors
- 👤 Shane Wallace H Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:58
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/1117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2631515A
Cited
US2715863A
Cited
US2722873A
Cited
US2721508A
Cited
US2722874A
Cited
FR1075023A
Cited
US2786402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |