Patent US3021907A successfully refreshed from Google Patents.
US3021907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground working implement
Assignee: Massey Ferguson Inc
•
Filing: 1958-11-10
•
Granted: 1962-02-20
•
Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 Lapins Alvin William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:07
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/023; A01B21/00; A01B21/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US338982A
Cited
US542339A
Cited
US2440550A
Cited
US2575622A
Cited
US2583830A
Cited
US2713297A
Cited
US2759313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |