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  • CPC
  • E21D23/18
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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

E21D23/18of advancing mechanisms
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mining shield base lift apparatuses and methods
    • Patent number 11,772,209
    • Issue date Oct 3, 2023
    • Swanson Industries, Inc.
    • Christopher Scott Larew
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Coal caving cycle
    • Patent number 9,068,452
    • Issue date Jun 30, 2015
    • Yancoal Technology Development PTY Ltd
    • Maohu Matthew Wang
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic circuit for longwall mining
    • Patent number 8,960,807
    • Issue date Feb 24, 2015
    • Tiefenbach Control Systems GmbH
    • Wilfried Weigel
    • F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
  • Information Patent Grant

    Control system for longwall face support frames
    • Patent number 5,181,451
    • Issue date Jan 26, 1993
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Guy Geuns
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic control arrangement
    • Patent number 4,613,257
    • Issue date Sep 23, 1986
    • Gewerkschaft Eisenhutte Westfalia
    • Walter Weirich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic control arrangement
    • Patent number 4,586,424
    • Issue date May 6, 1986
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Ernst-Gunter Nerlich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Valve arrangement for a walking mine roof support
    • Patent number 4,220,424
    • Issue date Sep 2, 1980
    • Bochumer Eisenhutte Heintzmann GmbH & Co
    • Ernst-Gunter Nerlich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3530490
    • Patent number 3,530,490
    • Issue date Sep 22, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3437011
    • Patent number 3,437,011
    • Issue date Apr 8, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3434389
    • Patent number 3,434,389
    • Issue date Mar 25, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3412391
    • Patent number 3,412,391
    • Issue date Nov 19, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3357313
    • Patent number 3,357,313
    • Issue date Dec 12, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3295814
    • Patent number 3,295,814
    • Issue date Jan 3, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3207041
    • Patent number 3,207,041
    • Issue date Sep 21, 1965
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    MINING SHIELD BASE LIFT METHODS
    • Publication number 20230405740
    • Publication date Dec 21, 2023
    • SWANSON INDUSTRIES, INC.
    • Christopher Scott Larew
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    MINING SHIELD BASE LIFT WEAR PAD
    • Publication number 20230405741
    • Publication date Dec 21, 2023
    • SWANSON INDUSTRIES, INC.
    • Christopher Scott Larew
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    MINING SHIELD BASE LIFT APPARATUSES AND METHODS
    • Publication number 20230339051
    • Publication date Oct 26, 2023
    • SWANSON INDUSTRIES, INC.
    • Christopher Scott Larew
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    COAL CAVING CYCLE
    • Publication number 20130187436
    • Publication date Jul 25, 2013
    • Maohu Matthew Wang
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Hydraulic Circuit For Longwall Mining
    • Publication number 20120104829
    • Publication date May 3, 2012
    • TIEFENBACH CONTROL SYSTEMS GMBH
    • Wilfried Weigel
    • E21 - EARTH DRILLING MINING