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and supported by two or more rows of struts parallel to the working face

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  • CPC
  • E21D23/0043
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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

E21D23/0043and supported by two or more rows of struts parallel to the working face
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mining rock deflector apparatus and method
    • Patent number 10,995,617
    • Issue date May 4, 2021
    • Swanson Industries, Inc.
    • Edward Protiva
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mining rock deflector apparatus and method
    • Patent number 10,808,533
    • Issue date Oct 20, 2020
    • Swanson Industries, Inc.
    • Edward Protiva
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Longwall mining roof supports
    • Patent number 9,670,777
    • Issue date Jun 6, 2017
    • Joy MM Delaware, Inc.
    • John Holme
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Longwall mining roof supports
    • Patent number 8,590,982
    • Issue date Nov 26, 2013
    • Joy MM Delaware, Inc.
    • John Holme
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method for automatically creating a defined face opening in longwal...
    • Patent number 8,567,871
    • Issue date Oct 29, 2013
    • RAG Aktiegesellschaft
    • Martin Junker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method for automatically producing a defined face opening in plow o...
    • Patent number 8,376,467
    • Issue date Feb 19, 2013
    • RAG Aktiengesellschaft
    • Martin Junker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,784,532
    • Issue date Nov 15, 1988
    • Gullick Dobson Limited
    • Kenneth D. Prescott
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,732,511
    • Issue date Mar 22, 1988
    • Dowty Mining Equipment Ltd.
    • Dennis F. Rutherford
    • 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

    Coal face support
    • Patent number 4,560,306
    • Issue date Dec 24, 1985
    • Dobson Park Industries Limited
    • Raymond G. Murfitt
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Support frame for underground mining operations
    • Patent number 4,511,290
    • Issue date Apr 16, 1985
    • Klockner-Becorit GmbH
    • Walter Lubojatzki
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support unit
    • Patent number 4,465,406
    • Issue date Aug 14, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Klaus Beckmann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,432,673
    • Issue date Feb 21, 1984
    • Dowty Mining Equipment Limited
    • Adrian C. Buckmaster
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,430,026
    • Issue date Feb 7, 1984
    • Dowty Mining Equipment Limited
    • Nigel Hill
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mineral mining installation
    • Patent number 4,427,321
    • Issue date Jan 24, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Walter Weirich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,411,558
    • Issue date Oct 25, 1983
    • Dowty Mining Equipment Limited
    • Dennis F. Rutherford
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mineral mining installation
    • Patent number 4,307,981
    • Issue date Dec 29, 1981
    • Gewerkschaft Eisenhutte Westfalia
    • Walter Weirich
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,268,193
    • Issue date May 19, 1981
    • Fletcher Sutcliffe Wild Limited
    • John C. Smith
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support unit
    • Patent number 4,231,685
    • Issue date Nov 4, 1980
    • Gewerkschaft Eisenhutte Westfalia
    • Harry Rosenberg
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support unit and assembly
    • Patent number 4,121,426
    • Issue date Oct 24, 1978
    • Gewerkschaft Eisenhutte Westfalia
    • Willy Heyer
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Self-advancing mine roof supports
    • Patent number 4,102,140
    • Issue date Jul 25, 1978
    • Gullick Dobson Limited
    • Archelaius Dawson Allen
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof bar for surface support elements
    • Patent number 4,092,831
    • Issue date Jun 6, 1978
    • Becorit Grubenausbau GmbH
    • Walter Lubojatsky
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Canopy and shield structure for supporting a shield in a seam-like...
    • Patent number 4,089,181
    • Issue date May 16, 1978
    • Thyssen Industrie AG
    • Manfred Koppers
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,065,930
    • Issue date Jan 3, 1978
    • Bochumer Eisenhutte Heintzmann GmbH & Co.
    • Klaus Spies
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,037,419
    • Issue date Jul 26, 1977
    • Dowty Mining Equipment Limited
    • Nigel Hill
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 3,996,753
    • Issue date Dec 14, 1976
    • Becorit Grubenausbau GmbH
    • Walter Lubojatsky
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3928981
    • Patent number 3,928,981
    • Issue date Dec 30, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3908389
    • Patent number 3,908,389
    • Issue date Sep 30, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3903703
    • Patent number 3,903,703
    • Issue date Sep 9, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3885396
    • Patent number 3,885,396
    • Issue date May 27, 1975
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents