TREA

by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important

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Industry

  • CPC
  • E21D15/585
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D15/00Props Chocks

Current Industry

E21D15/585by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Mechanical constant-resistance single prop continuous prop lifting...
    • Patent number 10,844,717
    • Issue date Nov 24, 2020
    • China University of Mining and Technology
    • Yanlong Chen
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Hydraulic assembly for a mining system
    • Patent number 9,982,799
    • Issue date May 29, 2018
    • Caterpillar Global Mining Europe GmbH
    • James Hassell
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Device for roof support of underground mine/tunnel
    • Patent number 9,267,375
    • Issue date Feb 23, 2016
    • Council of Scientific and Industrial Research
    • Sudhir Kumar Kashyap
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Arrangement for erecting columnar supporting elements for undergrou...
    • Patent number 4,332,512
    • Issue date Jun 1, 1982
    • Bochumer Eisenhuette Heintzmann GmbH & Co.
    • Peter Heintzmann
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Self-advancing mine roof supports
    • Patent number 3,991,578
    • Issue date Nov 16, 1976
    • Gullick Dobson Limited
    • John Cooke
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3567929
    • Patent number 3,567,929
    • Issue date Mar 2, 1971
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
  • Information Patent Grant

    3333425
    • Patent number 3,333,425
    • Issue date Aug 1, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3143862
    • Patent number 3,143,862
    • Issue date Aug 11, 1964
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3041975
    • Patent number 3,041,975
    • Issue date Jul 3, 1962
    • B30 - PRESSES
  • Information Patent Grant

    2907349
    • Patent number 2,907,349
    • Issue date Oct 6, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2816728
    • Patent number 2,816,728
    • Issue date Dec 17, 1957
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2617257
    • Patent number 2,617,257
    • Issue date Nov 11, 1952
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents