TREA

with load-measuring devices with alarm devices

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Industry

  • CPC
  • E21D15/46
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Parent Industries

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

Current Industry

E21D15/46with load-measuring devices with alarm devices
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Patents Grantslast 30 patents

  • 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

    Circuit board connection for a pressure sensor used in mining hydra...
    • Patent number 6,112,597
    • Issue date Sep 5, 2000
    • DBT Automation GmbH
    • Jurgen Tschope
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Quick-release pit prop
    • Patent number 5,967,702
    • Issue date Oct 19, 1999
    • Harmen Reinaldus Vogelzang
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method and apparatus for determining compressive stress in pillars
    • Patent number 5,668,325
    • Issue date Sep 16, 1997
    • Cyprus Amax Coal Company
    • Wm. Mark Hart
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Device for measuring the magnitude and direction of compression forces
    • Patent number 4,081,993
    • Issue date Apr 4, 1978
    • Bergwerksverband GmbH
    • Joachim Leonhardt
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3786511
    • Patent number 3,786,511
    • Issue date Jan 15, 1974
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3594773
    • Patent number 3,594,773
    • Issue date Jul 20, 1971
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3548867
    • Patent number 3,548,867
    • Issue date Dec 22, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3197168
    • Patent number 3,197,168
    • Issue date Jul 27, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2692924
    • Patent number 2,692,924
    • Issue date Oct 26, 1954
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2638075
    • Patent number 2,638,075
    • Issue date May 12, 1953
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2474464
    • Patent number 2,474,464
    • Issue date Jun 28, 1949
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1737514
    • Patent number 1,737,514
    • Issue date Nov 26, 1929
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1018325
    • Patent number 1,018,325
    • Issue date Feb 20, 1912
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents