Patent US1112631A successfully refreshed from Google Patents.
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US2799488A
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US
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Method of and apparatus for the continuous mining of mineral material by combined drilling, undercutting and shooting operations
Assignee: Individual
•
Filing: 1955-05-12
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Granted: 1957-07-16
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Expires: 1975-05-12
Abstract
No abstract record available.
Inventors
- 👤 Ambrose H Mandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:28
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/10; E21C27/12; E21C27/124; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5116; Y10T29/5118
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1603621A
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US1726963A
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US2083981A
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US2151328A
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US2281503A
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US2520040A
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US2694562A
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US2562841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |