TREA

with advancing devices separate from the supporting construction

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Industry

  • CPC
  • E21D23/10
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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

E21D23/10with advancing devices separate from the supporting construction
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Pit prop assembly
    • Patent number 4,008,578
    • Issue date Feb 22, 1977
    • Bochumer Eisenhutte Heintzmann & Company
    • Gunter Blumenthal
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Self-advancing support for use in the pit of coal or metal mine
    • Patent number 4,002,037
    • Issue date Jan 11, 1977
    • Taiiheiyo Engineering Incorporated
    • Masao Hujimori
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2859022
    • Patent number 2,859,022
    • Issue date Nov 4, 1958
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1450603
    • Patent number 1,450,603
    • Issue date Apr 3, 1923
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    MINING UNDERGROUND FORMATIONS
    • Publication number 20180195390
    • Publication date Jul 12, 2018
    • Seneca Industries Inc.
    • John Dickinson
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    TEMPORARY ROOF SUPPORT SYSTEM
    • Publication number 20160153278
    • Publication date Jun 2, 2016
    • Caterpillar Global Mining America LLC
    • David M. Denson
    • E21 - EARTH DRILLING MINING