Patent US3244164A successfully refreshed from Google Patents.
US3556599A
Expired / Lapsed
US
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Method of tunneling and tunneling shield with a drag loader
Assignee: Individual
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Filing: 1968-12-10
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Granted: 1971-01-19
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Expires: 1988-12-10
Abstract
Abstract AT ITS FORWARD END THE BOOM SUPPORTS BOTH A POWER TOOL, ADAPTED FOR DIGGING AT THE TUNNEL FACE, AND TO A HOE. THE REAR END OF THE BOOM IS PIVOTALLY CONNECTED TO A CARRIAGE WHICH IS SUPPORTED INSIDE THE SHIELD FOR FORE AND AFT MOVEMENT OVER BOTH THE FORWARD PORTION OF A CONVEYOR AND A RAMP WHICH DISCHARGES ONTO THE CONVEYOR. THE TOOL IS USED FIRST TO DIG THE TUNNEL FACE, AND THEN IS RETRACTED AND THE HOE IS USED TO DRAW MINED MATERIAL UP THE RAMP AND ONTO THE CONVEYOR.
Inventors
- 👤 Tyman H Fikse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:39
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12; E21D9/124; E21D9/06; E21D9/0642; E21D9/065; E21D9/08; E21D9/0875
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |