Patent US977564A successfully refreshed from Google Patents.
Patent US512464A successfully refreshed from Google Patents.
Patent US2420437A successfully refreshed from Google Patents.
US2420437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk harrow
Assignee: Individual
•
Filing: 1944-02-17
•
Granted: 1947-05-13
•
Expires: 1964-02-17
Abstract
No abstract record available.
Inventors
- 👤 Mcmahon William Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:12
CPC Classifications
A; A01; A01B; A01B21/00; A01B21/08; A01B21/086
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US112333A
Cited
US1635019A
Cited
US1817851A
Cited
US2140144A
Cited
US2169917A
Cited
US2268055A
Cited
US2298499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |