US2531072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mining coal or similar mineral
Assignee: SAFEWAY MINING MACHINE Corp
•
Filing: 1948-05-04
•
Granted: 1950-11-21
•
Expires: 1968-05-04
Abstract
No abstract record available.
Inventors
- 👤 George A Merchant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:01
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/10; E21C27/12; E21C27/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1753246A
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US1834587A
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US1796943A
Cited
US1917368A
Cited
DE616779C
Cited
DE614452C
Cited
US2368863A
Cited
US2415217A
Cited
US2424180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |