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Klaus Praefcke

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  • Berlin, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Liquid crystalline diketopyrrolopyrroles
    • Patent number 5,969,154
    • Issue date Oct 19, 1999
    • Ciba Specialty Chemicals Corporation
    • Zhimin Hao
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Carbocyclic compounds
    • Patent number 4,894,181
    • Issue date Jan 16, 1990
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Hexasubstituted cyclohexane compounds
    • Patent number 4,877,220
    • Issue date Oct 31, 1989
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Carbocyclic compounds
    • Patent number 4,758,373
    • Issue date Jul 19, 1988
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Carbocyclic six-membered ring compounds
    • Patent number 4,734,522
    • Issue date Mar 29, 1988
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Polymer compositions exhibiting liquid-crystalline phases
    • Patent number 4,713,196
    • Issue date Dec 15, 1987
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Triphenylene derivatives
    • Patent number 4,631,143
    • Issue date Dec 23, 1986
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
  • Information Patent Grant

    Carbocyclic six-membered ring compounds
    • Patent number 4,578,210
    • Issue date Mar 25, 1986
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Liquid crystalline cyclohexylcarbonitrile derivatives
    • Patent number 4,419,263
    • Issue date Dec 6, 1983
    • Merck Patent Gesellschaft mit beschrankter Haftung
    • Klaus Praefcke
    • C07 - ORGANIC CHEMISTRY