TREA

David A. Hampel

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  • Vancouver, WA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of drill bit manufacture and product
    • Patent number 4,454,205
    • Issue date Jun 12, 1984
    • ESCO Corporation
    • Ronald R. Miller
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Excavating tooth
    • Patent number 4,404,760
    • Issue date Sep 20, 1983
    • ESCO Corporation
    • Frecerick C. Hahn
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Excavating tooth
    • Patent number 4,335,532
    • Issue date Jun 22, 1982
    • ESCO Corporation
    • Frederick C. Hahn
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING