TREA

and supported by a strut or by a row of struts parallel to the working face

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  • CPC
  • E21D23/0039
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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

E21D23/0039and supported by a strut or by a row of struts parallel to the working face
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Longwall equipment with a hydrostatic tube balance thereon for dete...
    • Patent number 9,227,792
    • Issue date Jan 5, 2016
    • RAG Aktiengessellschaft
    • Armin Mozar
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
  • 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

    Roof supports
    • Patent number 4,815,898
    • Issue date Mar 28, 1989
    • Gewerkschaft Eisenhutte Westfalia GmbH
    • Egon Wojaczek
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,797,023
    • Issue date Jan 10, 1989
    • Gullick Dobson Limited
    • Roy Park
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supports
    • Patent number 4,792,261
    • Issue date Dec 20, 1988
    • Gullick Dobson Limited
    • Tom C. Bithell
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine-roof supports
    • Patent number 4,568,222
    • Issue date Feb 4, 1986
    • Dowty Mining Equipment Limited
    • Nigel Hill
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shield-type support frame
    • Patent number 4,557,635
    • Issue date Dec 10, 1985
    • Klockner-Becorit GmbH
    • Willy Watermann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mining equipment, mainly for extraction of heavy beds
    • Patent number 4,547,098
    • Issue date Oct 15, 1985
    • Kozponti Banyaszati Fejlesztesi Intezet
    • Matyas Martinko
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Two part mine roof support unit
    • Patent number 4,401,399
    • Issue date Aug 30, 1983
    • Gewerkschaft Eisenhutte Westfalia
    • Kunibert Becker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mining equipment, mainly for extraction of heavy beds
    • Patent number 4,386,878
    • Issue date Jun 7, 1983
    • Kozponti Banyaszati Fejlesztesi Intezet
    • Matvas Martinko
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof supporting structure
    • Patent number 4,299,517
    • Issue date Nov 10, 1981
    • Voest-Alpine Aktiengesellschaft
    • Gottfried Siebenhofer
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,252,477
    • Issue date Feb 24, 1981
    • Bochumer Eisenhutte Heintzmann GmbH & Co
    • Alfred Bollmann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shield timbering frame for timbering mines
    • Patent number 4,236,850
    • Issue date Dec 2, 1980
    • Thyssen Industrie AG
    • Manfred Koppers
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,222,686
    • Issue date Sep 16, 1980
    • Kloeckner Werke
    • Gunter Bell
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Coupling gear for lemniscate shield timbering frame
    • Patent number 4,183,701
    • Issue date Jan 15, 1980
    • Thyssen Industrie AG
    • Harry Oppenlander
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support shield structure for use in an excavation
    • Patent number 4,077,223
    • Issue date Mar 7, 1978
    • Rheinstahl AG
    • Manfred Koppers
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support for an underground mine gallery
    • Patent number 4,056,941
    • Issue date Nov 8, 1977
    • Klockner-Werke AG
    • Willy Watermann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mining shield support apparatus
    • Patent number 4,048,803
    • Issue date Sep 20, 1977
    • Banyaszati Kutato Intezet
    • Karoly Bole
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,027,489
    • Issue date Jun 7, 1977
    • Dowty Mining Equipment Limited
    • John Hirst Walker
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic pit prop
    • Patent number 3,992,888
    • Issue date Nov 23, 1976
    • Bochumer Eisenhutte Heintzmann & Company
    • Hans-Ferdinand Bemmerl
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Excavation roof support
    • Patent number 3,990,251
    • Issue date Nov 9, 1976
    • Klockner-Werke AG
    • Karl Heinz Wehner
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3911686
    • Patent number 3,911,686
    • Issue date Oct 14, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3902325
    • Patent number 3,902,325
    • Issue date Sep 2, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3898845
    • Patent number 3,898,845
    • Issue date Aug 12, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3896626
    • Patent number 3,896,626
    • Issue date Jul 29, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3891275
    • Patent number 3,891,275
    • Issue date Jun 24, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3874178
    • Patent number 3,874,178
    • Issue date Apr 1, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3837170
    • Patent number 3,837,170
    • Issue date Sep 24, 1974
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3811288
    • Patent number 3,811,288
    • Issue date May 21, 1974
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3779023
    • Patent number 3,779,023
    • Issue date Dec 18, 1973
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents