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Willard J. Harder

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  • Minneapolis, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Solar liquid heating system
    • Patent number 4,338,921
    • Issue date Jul 13, 1982
    • Bethany Fellowship, Inc.
    • Willard J. Harder
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Solar energy collecting panel assembly
    • Patent number 4,296,741
    • Issue date Oct 27, 1981
    • Bethany Fellowship, Inc.
    • Willard J. Harder
    • F24 - HEATING RANGES VENTILATING