US2562841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine head
Assignee: Individual
•
Filing: 1950-07-11
•
Granted: 1951-07-31
•
Expires: 1970-07-11
Abstract
No abstract record available.
Inventors
- 👤 Charles E Compton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:16
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE110742C
Cited
US444476A
Cited
US799880A
Cited
US1273869A
Cited
US1271396A
Cited
US1445085A
Cited
US1505779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |