TREA

Air locks

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Industry

  • CPC
  • E21F1/145
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS E21F1/00Ventilation of mines or tunnels Distribution of ventilating currents

Current Industry

E21F1/145Air locks
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Method of supporting mine walls and installing a mine stopping
    • Patent number 6,715,961
    • Issue date Apr 6, 2004
    • Jack Kennedy Metal Products and Buildings, Inc.
    • William R. Kennedy
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Multiple tier stopping and method of constructing stopping
    • Patent number 6,682,263
    • Issue date Jan 27, 2004
    • Jack Kennedy Metal Products and Buildings, Inc.
    • William R. Kennedy
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine stopping
    • Patent number 6,379,084
    • Issue date Apr 30, 2002
    • Jack Kennedy Metal Products and Buildings, Inc.
    • William R. Kennedy
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Pumpable mine seal
    • Patent number 5,401,120
    • Issue date Mar 28, 1995
    • David A. Hussey
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine stopping
    • Patent number 4,547,094
    • Issue date Oct 15, 1985
    • William R. Kennedy
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents