US2548952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal mining and conveying machine
Assignee: Individual
•
Filing: 1948-08-27
•
Granted: 1951-04-17
•
Expires: 1968-08-27
Abstract
No abstract record available.
Inventors
- 👤 Crossland Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:29
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US504179A
Cited
US504180A
Cited
GB190502227A
Cited
US1674870A
Cited
US1603621A
Cited
US1554723A
Cited
US2229087A
Cited
US2320653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |