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US879822A
Expired / Lapsed
US
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Sink-shaft drill.
Assignee: J P KARNS TUNNELING MACHINE CO
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Filing: 1907-03-15
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Granted: 1908-02-18
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Expires: 1927-03-15
Abstract
No abstract record available.
Inventors
- 👤 John Prue Karns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:13
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1057; E21B17/1064
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) | 1911-02-17 | 1911-08-19 | 1912-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-02-17 | 1915-08-19 | 1916-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-02-17 | 1919-08-19 | 1920-02-18 | $7700.00 | Window Closed / Lapsed |