Patent US1143897A successfully refreshed from Google Patents.
US1143897A
Expired / Lapsed
US
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Mining-machine.
Assignee: Individual
•
Filing: 1912-07-08
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Granted: 1915-06-22
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Expires: 1932-07-08
Abstract
No abstract record available.
Inventors
- 👤 Jefferson E Flexner
- 👤 Edward O'toole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1918-06-21 | 1918-12-21 | 1919-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1922-06-21 | 1922-12-21 | 1923-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1926-06-21 | 1926-12-21 | 1927-06-22 | $7700.00 | Window Closed / Lapsed |