TREA

C. Dempsey Holstein

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  • Princeton, WV, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Mine stopping
    • Patent number 5,934,990
    • Issue date Aug 10, 1999
    • The Tensar Corporation
    • John E. Steffenino
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Sprayable wall sealant
    • Patent number 5,236,499
    • Issue date Aug 17, 1993
    • Sandvik Rock Tools, Inc.
    • Raymond R. Chervenak
    • C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
  • Information Patent Grant

    Sealant for concrete or cinder block walls
    • Patent number 5,043,019
    • Issue date Aug 27, 1991
    • Sandvik Rock Tools, Inc.
    • Raymond R. Chervenak
    • C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES