TREA

by a clamping ring

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Industry

  • CPC
  • E21D15/325
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Parent Industries

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

Current Industry

E21D15/325by a clamping ring
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Yieldable prop having a restraint arrangement
    • Patent number 7,445,408
    • Issue date Nov 4, 2008
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable prop having a yield section
    • Patent number 7,390,147
    • Issue date Jun 24, 2008
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable prop
    • Patent number 7,360,971
    • Issue date Apr 22, 2008
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable prop
    • Patent number 7,334,968
    • Issue date Feb 26, 2008
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable prop having a yield section
    • Patent number 7,134,810
    • Issue date Nov 14, 2006
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable prop
    • Patent number 7,114,888
    • Issue date Oct 3, 2006
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Resilienty compressible support column for use in a mine
    • Patent number 5,564,867
    • Issue date Oct 15, 1996
    • Bochumer Eisenhutte Heintzmann GmbH & Co. KG
    • Lothar Domanski
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3197244
    • Patent number 3,197,244
    • Issue date Jul 27, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2973178
    • Patent number 2,973,178
    • Issue date Feb 28, 1961
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2890854
    • Patent number 2,890,854
    • Issue date Jun 16, 1959
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    Yieldable Prop Having A Yield Section
    • Publication number 20070059109
    • Publication date Mar 15, 2007
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable prop having a yield section
    • Publication number 20070031197
    • Publication date Feb 8, 2007
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable prop
    • Publication number 20050141971
    • Publication date Jun 30, 2005
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable prop having a yield section
    • Publication number 20040223815
    • Publication date Nov 11, 2004
    • Jennmar Corpotation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable prop
    • Publication number 20040081518
    • Publication date Apr 29, 2004
    • Jennmar Corporation
    • John C. Stankus
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Yieldable prop
    • Publication number 20030161693
    • Publication date Aug 28, 2003
    • John C. Stankus
    • E21 - EARTH DRILLING MINING