Patent US2857724A successfully refreshed from Google Patents.
US2857724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Harrow frame, leveling device therefor, and disc assembly and mounting
Assignee: Columbus Iron Works Co
•
Filing: 1953-05-20
•
Granted: 1958-10-28
•
Expires: 1973-05-20
Abstract
No abstract record available.
Inventors
- 👤 William D Kenney
- 👤 Julius C Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:33
CPC Classifications
A; A01; A01B; A01B23/00; A01B23/04; A01B23/046
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1365013A
Cited
US1830761A
Cited
US1861626A
Cited
US1963426A
Cited
US2029250A
Cited
GB516434A
Cited
US2320742A
Cited
US2430434A
Cited
GB572240A
Cited
US2424185A
Cited
US2464615A
Cited
US2452710A
Cited
US2494115A
Cited
US2640718A
Cited
US2562486A
Cited
US2655088A
Cited
US2599084A
Cited
US2684021A
Cited
US2637564A
Cited
US2693748A
Cited
US2717479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |