TREA

Retractable cantilever extensions therefor

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Industry

  • CPC
  • E21D23/063
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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

E21D23/063Retractable cantilever extensions therefor
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

    Shaking control unit for a hydraulic cylinder
    • Patent number 5,000,622
    • Issue date Mar 19, 1991
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Siegmar Block
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shaking control unit for a hydraulic cylinder
    • Patent number 4,907,918
    • Issue date Mar 13, 1990
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Siegmar Block
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method of separating the upper coal in seams
    • Patent number 4,798,417
    • Issue date Jan 17, 1989
    • Bochumer Eisenhutte Heintzmann GmbH & Co. HG
    • Gunter Blumenthal
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support suitable for use in mines
    • Patent number 4,573,828
    • Issue date Mar 4, 1986
    • Dowty Mining Equipment Limited
    • Michael D. Jones
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Roof support for use in mines
    • Patent number 4,492,495
    • Issue date Jan 8, 1985
    • Dowty Mining Equipment Limited
    • Dennis F. Rutherford
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic control arrangement for a roof support unit of a mineral...
    • Patent number 4,440,522
    • Issue date Apr 3, 1984
    • Gewerkschaft Eisenhutte Westfalia
    • Michael Dettmers
    • 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

    Mine roof support
    • Patent number 4,309,131
    • Issue date Jan 5, 1982
    • Bochumer Eisenhutte Heintzmann GmbH & Co
    • Alfred Bollmann
    • 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 4,124,984
    • Issue date Nov 14, 1978
    • Huwood Limited
    • Graham J. Saunders
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roof support
    • Patent number 4,114,387
    • Issue date Sep 19, 1978
    • Dowty Mining Equipment Limited
    • Dennis Franklin Rutherford
    • 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

    3889475
    • Patent number 3,889,475
    • Issue date Jun 17, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3872678
    • Patent number 3,872,678
    • Issue date Mar 25, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3601997
    • Patent number 3,601,997
    • Issue date Aug 31, 1971
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3534559
    • Patent number 3,534,559
    • Issue date Oct 20, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3466875
    • Patent number 3,466,875
    • Issue date Sep 16, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3441317
    • Patent number 3,441,317
    • Issue date Apr 29, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3399927
    • Patent number 3,399,927
    • Issue date Sep 3, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3320751
    • Patent number 3,320,751
    • Issue date May 23, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3312071
    • Patent number 3,312,071
    • Issue date Apr 4, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3240021
    • Patent number 3,240,021
    • Issue date Mar 15, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3216202
    • Patent number 3,216,202
    • Issue date Nov 9, 1965
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents