US3349567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof support and method of providing same
Assignee: Individual
•
Filing: 1964-06-03
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Granted: 1967-10-31
•
Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 John E Munn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:00
CPC Classifications
E; E21; E21D; E21D20/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE METHOD OF PROVIDING A ROOF SUPPORT IN A MINE WHICH COMPRISES DRILLING A HOLE INTO THE MINE ROOF, INSERTING A METAL TUBE OPEN AT ITS LOWER END INTO THE HOLE WITH ITS END EXTENDING BELOW THE ROOF INTO WHICH THE TUBE IS ENTERED AND WITH A ROOF-SUPPORTING ELEMENT SECURED TO THE EXTERIOR OF ITS LOWER END, INSERTING A PROBE-LIKE STRUCTURE WITH A MAGNETIC PULSATION DEFORMING COIL THEREON INTO THE TUBE, SAID PROBE HAVING LEAD WIRES FOR CONDUCTING CURRENT OF THE COIL AT ITS LOWER END, BULGING A PORTION OF THE LENGTH OF THE TUBE INTO THE EARTH FORMATION IN WHICH THE HOLE IS MADE BY MAGNETIC PULSATION THROUGH THE APPLICATION OF ELECTRICAL CURRENT TO SAID COIL, AND THEREAFTER WITHDRAWING THE PROBE AND ITS COIL FROM THE INTERIOR OF THE TUBE.
Claim 2
Independent Claim
131 words
THE METHOD OF PROVIDING A ROOF SUPPORT IN A MINE WHICH COMPRISES DRILLING A HOLE INTO THE MINE ROOF, INSERTING A METAL TUBE OPEN AT ITS LOWER END INTO THE HOLE WITH ITS END EXTENDING BELOW THE ROOF INTO WHICH THE TUBE IS ENTERED AND WITH A ROOF-SUPPORTING ELEMENT SECURED TO THE EXTERIOR OF ITS LOWER END, INSERTING A PROBE-LIKE STRUCTURE WITH A MAGNETIC PULSATION DEFORMING COIL THEREON INTO THE TUBE, SAID PROBE HAVING LEAD WIRES FOR CONDUCTING CURRENT OF THE COIL AT ITS LOWER END, BULGING A PORTION OF THE LENGTH OF THE TUBE INTO THE EARTH FORMATION IN WHICH THE HOLE IS MADE BY MAGNETIC PULSATION THROUGH THE APPLICATION OF ELECTRICAL CURRENT TO SAID COIL, AND THEREAFTER WITHDRAWING THE PROBE AND ITS COIL FROM THE INTERIOR OF THE TUBE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |