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US2556357A
Expired / Lapsed
US
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Combined mine drill, timber jack, and mine post
Assignee: Individual
•
Filing: 1948-10-29
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Granted: 1951-06-12
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Expires: 1968-10-29
Abstract
No abstract record available.
Inventors
- 👤 John C Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:18
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/006; E21D; E21D15/00; E21D15/14; E21D15/16; E21D15/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1189901A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |