Forming a shaft for an underground mine
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United States of America Patent
Stats
-
Nov 26, 2013
Grant Date -
Dec 20, 2012
app pub date -
Jun 15, 2012
filing date -
Jun 30, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In forming a mine shaft for an underground mine, earth excavated by a boring machine may be transported upwardly by a handling unit to a transfer station where it may be transferred into skips, which may be raised and lowered along skip guides within the shaft hole for transport of the excavated material to an earth surface region. The transfer station may be moved downwardly as excavation progresses.
First Claim
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International Classification(s)
- 2012 Application Filing Year
- E21D Class
- 67 Applications Filed
- 57 Patents Issued To-Date
- 85.08 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- E21D Class
- 6.67 % this patent is cited more than
- 12 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 26, 2025 |
