Patent US2919121A successfully refreshed from Google Patents.
US2919121A
Expired / Lapsed
US
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Mining and excavating machine of the rotary type
Assignee: Individual
•
Filing: 1957-09-25
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Granted: 1959-12-29
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Ruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:49
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US537899A
Cited
US1073184A
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US2211223A
Cited
US2798707A
Cited
US2756037A
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US2821374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |