US2765721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor implement linkage
Assignee: Calkins Manufacturing Co
•
Filing: 1951-05-24
•
Granted: 1956-10-09
•
Expires: 1971-05-24
Abstract
No abstract record available.
Inventors
- 👤 Fred T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:51
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/04; A01B3/00; A01B3/36; E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7622
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1864639A
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US2092608A
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US2455727A
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US2616349A
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CH266566A
Cited
US2659286A
Cited
US2580532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |