TREA

by means of wedges or wedge combinations

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Industry

  • CPC
  • E21D15/285
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Parent Industries

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

Current Industry

E21D15/285by means of wedges or wedge combinations
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Yieldable support prop and method
    • Patent number 8,821,075
    • Issue date Sep 2, 2014
    • Strata Products Worldwide LLC
    • Clifford A. McCartney
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Support for underground mining and tunnel construction
    • Patent number 6,056,480
    • Issue date May 2, 2000
    • Theodor Kolk
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Prop for use in underground mining or tunnel construction
    • Patent number 5,921,718
    • Issue date Jul 13, 1999
    • Theodor Kolk
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2765140
    • Patent number 2,765,140
    • Issue date Oct 2, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2745622
    • Patent number 2,745,622
    • Issue date May 15, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2699914
    • Patent number 2,699,914
    • Issue date Jan 18, 1955
    • E04 - BUILDING
  • Information Patent Grant

    2661180
    • Patent number 2,661,180
    • Issue date Dec 1, 1953
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2643143
    • Patent number 2,643,143
    • Issue date Jun 23, 1953
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2450374
    • Patent number 2,450,374
    • Issue date Sep 28, 1948
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2297469
    • Patent number 2,297,469
    • Issue date Sep 29, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2273389
    • Patent number 2,273,389
    • Issue date Feb 17, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2192079
    • Patent number 2,192,079
    • Issue date Feb 27, 1940
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2160454
    • Patent number 2,160,454
    • Issue date May 30, 1939
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2066433
    • Patent number 2,066,433
    • Issue date Jan 5, 1937
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2021272
    • Patent number 2,021,272
    • Issue date Nov 19, 1935
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    PROP
    • Publication number 20140050538
    • Publication date Feb 20, 2014
    • MINE SUPPORT PRODUCTS (PTY) LTD
    • Christian NISSEN
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable support prop and method
    • Publication number 20130108376
    • Publication date May 2, 2013
    • Strata Products Worldwide, LLC
    • Clifford A. McCartney
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Support column collet assembly
    • Publication number 20060207210
    • Publication date Sep 21, 2006
    • E. Bane Kroeger
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Prop device for mining and tunnel construction
    • Publication number 20020031407
    • Publication date Mar 14, 2002
    • Richard Voss
    • E21 - EARTH DRILLING MINING