TREA

by means of wheels, rollers, caterpillars, belts or worm screws

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Industry

  • CPC
  • E21D23/088
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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

E21D23/088by means of wheels, rollers, caterpillars, belts or worm screws
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Apparatus for forming an underground tunnel
    • Patent number 9,631,491
    • Issue date Apr 25, 2017
    • Matthew Lumb
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Movable consolidating trestle for securing the excavating edge
    • Patent number 4,812,081
    • Issue date Mar 14, 1989
    • Voest-Alpine Aktiengesellschaft
    • Ernst Urschitz
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Trestle being displaceable on caterpillar
    • Patent number 4,747,730
    • Issue date May 31, 1988
    • Voest-Alpine Aktiengesellschaft
    • Ernst Urschitz
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mobile mine-roof support
    • Patent number 4,737,051
    • Issue date Apr 12, 1988
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Hans Bull
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Continuous sliding support gantry for a large passage
    • Patent number 4,358,224
    • Issue date Nov 9, 1982
    • Charbonnages de France
    • Guy Blanpain
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Sliding supporting gallery
    • Patent number 4,348,138
    • Issue date Sep 7, 1982
    • Charbonnages de France
    • Guy Blampain
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Carriage with articulated track
    • Patent number 4,232,911
    • Issue date Nov 11, 1980
    • Charbonnages de France
    • Alfred A. M. Valantin
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Advancing support
    • Patent number 4,129,990
    • Issue date Dec 19, 1978
    • Charbonnages de France
    • Alfred Valantin
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support
    • Patent number 4,114,385
    • Issue date Sep 19, 1978
    • Charbonnages de France
    • Alfred Alphonse Marie Valantin
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof supports
    • Patent number 4,109,473
    • Issue date Aug 29, 1978
    • Charbonnages de France
    • Alfred A. Valantin
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Progressive timbering device
    • Patent number 4,107,931
    • Issue date Aug 22, 1978
    • Halbach and Braun
    • Ernst Braun
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Movable roof support mechanism
    • Patent number 4,026,118
    • Issue date May 31, 1977
    • The United States of America as represented by the Secretary of the Interior
    • Frank Vernon McCay
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2899800
    • Patent number 2,899,800
    • Issue date Aug 18, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2826898
    • Patent number 2,826,898
    • Issue date Mar 18, 1958
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2752757
    • Patent number 2,752,757
    • Issue date Jul 3, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2714505
    • Patent number 2,714,505
    • Issue date Aug 2, 1955
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents