TREA

Donald Siefkes

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  • Troy, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Heat exchanger having close packed spheres
    • Patent number 5,335,639
    • Issue date Aug 9, 1994
    • Donald Siefkes
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • Information Patent Grant

    Foamed metal heat device
    • Patent number 5,231,968
    • Issue date Aug 3, 1993
    • Donald Siefkes
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS