Patent US2920879A successfully refreshed from Google Patents.
US2920879A
Expired / Lapsed
US
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Mining apparatus utilizing two side cutting augers
Assignee: Goodman Manufacturing Co LP
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Filing: 1956-10-18
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Granted: 1960-01-12
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Herman W Driehaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US376719A
Cited
US1336440A
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GB177813A
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DE382687C
Cited
FR560813A
Cited
US2327928A
Cited
US2546899A
Cited
GB734582A
Cited
US2776809A
Cited
US2722409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |