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Richard A. Dortzbach

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  • Clayton, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Chimney top spark arrester and damper
    • Patent number 5,848,931
    • Issue date Dec 15, 1998
    • Dortzbach; Richard A.
    • Richard A. Dortzbach
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
  • Information Patent Grant

    Thermal pipe guard
    • Patent number 5,402,830
    • Issue date Apr 4, 1995
    • Richard A. Dortzbach
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Adjustable spark arrester for fireplace flue
    • Patent number 4,386,571
    • Issue date Jun 7, 1983
    • Richard A. Dortzbach
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES