Patent US3439749A successfully refreshed from Google Patents.
US3439749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawbar construction for furrow opener
Assignee: Case LLC
•
Filing: 1965-10-22
•
Granted: 1969-04-22
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Nils O Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:17
CPC Classifications
A; A01; A01C; A01C5/00; A01C5/06; A01B; A01B63/00; A01B63/14; A01B63/16; A01B63/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2364666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |