US2610841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plow type of coal mining machine
Assignee: Jeffrey Manufacturing Co
•
Filing: 1950-09-23
•
Granted: 1952-09-16
•
Expires: 1970-09-23
Abstract
No abstract record available.
Inventors
- 👤 Pearson David
- 👤 Yarmak Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:10
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |