TREA

Hans-Eckhard Mengel

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  • Celle, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Drill bit
    • Patent number 4,635,738
    • Issue date Jan 13, 1987
    • Norton Christensen, Inc.
    • Hans Schillinger
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Tooth design to avoid shearing stresses
    • Patent number 4,515,226
    • Issue date May 7, 1985
    • Norton Christensen, Inc.
    • Hans-Eckhard Mengel
    • E21 - EARTH DRILLING MINING