TREA

Dirk N. Granberg

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  • Brookfield, WI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Scale agitator
    • Patent number 4,898,124
    • Issue date Feb 6, 1990
    • A. O. Smith Corporation
    • Dirk N. Granberg
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Combustion element for a radiant energy burner and method of making...
    • Patent number 4,721,456
    • Issue date Jan 26, 1988
    • A. O. Smith Corporation
    • Dirk N. Granberg
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
  • Information Patent Grant

    High efficiency water heater
    • Patent number 4,651,714
    • Issue date Mar 24, 1987
    • A. D. Smith Corporation
    • Dirk N. Granberg
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Radiant energy burner
    • Patent number 4,599,066
    • Issue date Jul 8, 1986
    • A. O. Smith Corp.
    • Dirk N. Granberg
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES