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David E. Anderson

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  • Elk River, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    External manhole chimney seal
    • Patent number 4,475,845
    • Issue date Oct 9, 1984
    • The Cretex Companies, Inc.
    • Frank J. Odill
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Manhole chimney seal
    • Patent number 4,469,467
    • Issue date Sep 4, 1984
    • The Cretex Companies, Inc.
    • Frank J. Odill
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Cleanout fitting
    • Patent number 4,360,041
    • Issue date Nov 23, 1982
    • The Cretex Companies, Inc.
    • John D. Hagan
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...