TREA

with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure

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Industry

  • CPC
  • E21D15/22
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Parent Industries

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

Current Industry

E21D15/22with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Yieldable prop for roof and ground control
    • Patent number 7,503,731
    • Issue date Mar 17, 2009
    • Ben L. Seegmiller
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yielding column
    • Patent number 6,655,877
    • Issue date Dec 2, 2003
    • W. David Calhoun
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable roof support system
    • Patent number 5,400,994
    • Issue date Mar 28, 1995
    • Dyckerhoff & Widmann AG of Munich
    • Khaled Shawwaf
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable connection
    • Patent number 4,560,305
    • Issue date Dec 24, 1985
    • Franz Powondra
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine roadway support stilt
    • Patent number 4,382,721
    • Issue date May 10, 1983
    • Holywell Engineering Limited
    • Norman S. King
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Device for limiting stresses in particular for buried tubular struc...
    • Patent number 4,252,464
    • Issue date Feb 24, 1981
    • Davum
    • Pierre Habib
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Stilts for use in mine workings
    • Patent number 3,994,467
    • Issue date Nov 30, 1976
    • GKN Sankey Limited
    • Colin Henry Pike
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2895454
    • Patent number 2,895,454
    • Issue date Jul 21, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2578903
    • Patent number 2,578,903
    • Issue date Dec 18, 1951
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    1821020
    • Patent number 1,821,020
    • Issue date Sep 1, 1931
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1736301
    • Patent number 1,736,301
    • Issue date Nov 19, 1929
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1677796
    • Patent number 1,677,796
    • Issue date Jul 17, 1928
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1611293
    • Patent number 1,611,293
    • Issue date Dec 21, 1926
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1499320
    • Patent number 1,499,320
    • Issue date Jun 24, 1924
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    Yieldable prop for roof and ground control
    • Publication number 20060133899
    • Publication date Jun 22, 2006
    • Ben L. Seegmiller
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    YIELDING COLUMN
    • Publication number 20030194280
    • Publication date Oct 16, 2003
    • W. David Calhoun
    • E21 - EARTH DRILLING MINING