US2839281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring type mining machine having an adjustable boring head
Assignee: Union Carbide Corp
•
Filing: 1954-09-16
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Granted: 1958-06-17
•
Expires: 1974-09-16
Abstract
No abstract record available.
Inventors
- 👤 Paul L Alspaugh
- 👤 John W Heimaster
- 👤 Roy L Mcneill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:42
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22; E21F; E21F13/00; E21F13/08; E21F13/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US860301A
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US1674870A
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US2007907A
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US2165404A
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US2327928A
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US2320196A
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US2384397A
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US2606010A
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US2694562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |