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Patent US2670943A successfully refreshed from Google Patents.
US2670943A
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Mining machine
Assignee: Mavor and Coulson Ltd
•
Filing: 1949-03-26
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Granted: 1954-03-02
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Expires: 1969-03-26
Abstract
No abstract record available.
Inventors
- 👤 Vogel Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:44
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US405188A
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US511869A
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US752180A
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DE501194C
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AT32132B
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GB190806094A
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US960958A
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US2420755A
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US2554005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |