TREA

Josef Siekmeyer

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  • Ratingen, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Screwed pipe joint
    • Patent number 5,048,871
    • Issue date Sep 17, 1991
    • Mannesmann Aktiengesellschaft
    • Gerd Pfeiffer
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Drill pipe coupling
    • Patent number 4,955,644
    • Issue date Sep 11, 1990
    • Mannesmann Aktiengellschaft
    • Gerd Pfeiffer
    • E21 - EARTH DRILLING MINING