TREA

Pivoted cantilever extensions therefor

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  • CPC
  • E21D23/066
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Parent Industries

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

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E21D23/066Pivoted cantilever extensions therefor
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Longwall optimization control
    • Patent number 10,208,592
    • Issue date Feb 19, 2019
    • Joy Global Underground Mining LLC
    • Gareth Rimmington
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support monitoring for longwall system
    • Patent number 10,184,338
    • Issue date Jan 22, 2019
    • Joy Global Underground Mining LLC
    • Paul M. Siegrist
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support monitoring for longwall system
    • Patent number 9,739,148
    • Issue date Aug 22, 2017
    • Joy MM Delaware, Inc.
    • Paul M. Siegrist
    • E21 - EARTH DRILLING MINING
  • 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

    Mining system with drilling, loading, conveyor, and support
    • Patent number 6,848,748
    • Issue date Feb 1, 2005
    • DBT GmbH
    • Ulrich Paschedag
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Longwall mining with blasting
    • Patent number 6,672,674
    • Issue date Jan 6, 2004
    • DBT GmbH
    • Ulrich Paschedag
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof cap assembly with supporting cylinders for roof support mechanism
    • Patent number 4,773,795
    • Issue date Sep 27, 1988
    • Klockner-Becorit GmbH
    • Willy Watermann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Multi-part roof-contacting structures of mine roof supports
    • Patent number 4,755,084
    • Issue date Jul 5, 1988
    • Gewerkschaft Eisenhutte Westfalia GmbH
    • Bernd Peters
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Adjustable cap unit
    • Patent number 4,755,083
    • Issue date Jul 5, 1988
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Ernst-Gunter Nerlich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,609,308
    • Issue date Sep 2, 1986
    • Dowty Mining Equipment Limited
    • Nigel Hill
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,548,527
    • Issue date Oct 22, 1985
    • Dowty Mining Equipment Limited
    • Christopher J. Bishop
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,512,686
    • Issue date Apr 23, 1985
    • Dowty Mining Equipment Limited
    • John H. Waters
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,449,860
    • Issue date May 22, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Kunibert Becker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Cap positioning mechanism
    • Patent number 4,447,174
    • Issue date May 8, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Kunibert Becker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,347,021
    • Issue date Aug 31, 1982
    • Gewerkschaft Eisenhutte Westfalia
    • Burckhardt Elsner
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine working apparatus
    • Patent number 4,269,546
    • Issue date May 26, 1981
    • Huwood Limited
    • Graham J. Saunders
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic roof-support frame
    • Patent number 4,266,892
    • Issue date May 12, 1981
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Alfred Maykemper
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shield-carrying roof support unit
    • Patent number 4,197,035
    • Issue date Apr 8, 1980
    • Vereinigte Osterreichische Eisen- und Stahlwerke - Alpine Montan Aktiengesell...
    • Gottfried Siebenhofer
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic walking roof-support frame
    • Patent number 4,155,676
    • Issue date May 22, 1979
    • Hermann Hemscheidt Maschinenfabrik GmbH & Co.
    • Hans-Otto Friedrichs
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shield structure
    • Patent number 4,020,640
    • Issue date May 3, 1977
    • Vereinigte Osterreichische Eisen- und Stahlwerke-Alpine Montan Aktiengesellsc...
    • Siegfried Sigott
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3848928
    • Patent number 3,848,928
    • Issue date Nov 19, 1974
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3383868
    • Patent number 3,383,868
    • Issue date May 21, 1968
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents