TREA

for sequential movement

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Industry

  • CPC
  • E21D23/20
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D23/00Mine roof supports for step- by- step movement

Current Industry

E21D23/20for sequential movement
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Electrohydraulic coal-mining system
    • Patent number 4,900,091
    • Issue date Feb 13, 1990
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Gustav Neu
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine-roof support control means
    • Patent number 4,476,898
    • Issue date Oct 16, 1984
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Karl Krieger
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Control systems for mineral mining installations
    • Patent number 4,451,181
    • Issue date May 29, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Thomas Trumper
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulically-operated devices
    • Patent number 4,422,808
    • Issue date Dec 27, 1983
    • Dowty Mining Equipment Limited
    • Stephen P. Cook
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Thrust device using hydraulic jacks
    • Patent number 4,248,136
    • Issue date Feb 3, 1981
    • Charbonnages de France
    • Guy Blanpain
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Longwall mining apparatus
    • Patent number 4,109,472
    • Issue date Aug 29, 1978
    • Dowty Mining Equipment Limited
    • Robert G. Harris
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3541926
    • Patent number 3,541,926
    • Issue date Nov 24, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3514961
    • Patent number 3,514,961
    • Issue date Jun 2, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3246576
    • Patent number 3,246,576
    • Issue date Apr 19, 1966
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents