TREA

Karlfried Keller

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  • Frankfurt am Main, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Processing for tanning leather
    • Patent number 4,822,372
    • Issue date Apr 18, 1989
    • Cassella Aktiengesellschaft
    • Frank Forster
    • C14 - SKINS HIDES PELTS LEATHER
  • Information Patent Grant

    Process for tanning leather
    • Patent number 4,810,252
    • Issue date Mar 7, 1989
    • Hoechst Aktiengesellschaft
    • Hermann Becker
    • C14 - SKINS HIDES PELTS LEATHER
  • Information Patent Grant

    Preparation of methoxy-methyl melamines
    • Patent number 4,223,141
    • Issue date Sep 16, 1980
    • Cassella Aktiengesellschaft
    • Hans Honel
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Preparation of melamine derivatives
    • Patent number 4,143,016
    • Issue date Mar 6, 1979
    • Cassella Aktiengesellschaft
    • Hans Honel
    • C07 - ORGANIC CHEMISTRY