US2821374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal mining machine having a pivotally mounted cutter tube
Assignee: Canadian Ingersoll Rand Co Ltd
•
Filing: 1955-11-30
•
Granted: 1958-01-28
•
Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Harold H Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:25
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733057A
Cited
US747869A
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US2083834A
Cited
DE722760C
Cited
US2694562A
Cited
US2562841A
Cited
US2756037A
Cited
US2722409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |