Patent US4182831A successfully refreshed from Google Patents.
Patent US2597345A successfully refreshed from Google Patents.
US2597345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground loading machine, including a flexible trough
Assignee: Jeffrey Manufacturing Co
•
Filing: 1949-03-16
•
Granted: 1952-05-20
•
Expires: 1969-03-16
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:49
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12; E21D9/126; E21D9/128
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US161543A
Cited
US721571A
Cited
US1128880A
Cited
US1997247A
Cited
US2047589A
Cited
GB490066A
Cited
US2413508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |