TREA

Fritz Frehn

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  • Krefeld, DT
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Patents Grantslast 30 patents

  • Information Patent Grant

    Corrosion and wear resistant steel sinter alloy
    • Patent number 3,967,935
    • Issue date Jul 6, 1976
    • Deutsche Edelstahlwerke Gesellschaft mit beschrankter Haftung
    • Fritz Frehn
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
  • Information Patent Grant

    Sintering steel-bonded carbide hard alloy
    • Patent number 3,942,954
    • Issue date Mar 9, 1976
    • Deutsche Edelstahlwerke Aktiengesellschaft
    • Fritz Frehn
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...