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Wilfried G. Holtje

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  • Wilmington, DE, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Process for preparing 2-anilinoacridone
    • Patent number 4,544,746
    • Issue date Oct 1, 1985
    • Ciba-Geigy Corporation
    • Wilfried G. Holtje
    • C07 - ORGANIC CHEMISTRY
  • Information Patent Grant

    Light stable quinacridonequinone pigments
    • Patent number 4,426,231
    • Issue date Jan 17, 1984
    • E. I. Du Pont de Nemours and Company
    • Wilfried G. Holtje
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
  • Information Patent Grant

    Light stable quinacridonequinone yellow pigment
    • Patent number 4,286,998
    • Issue date Sep 1, 1981
    • E. I. DuPont de Nemours and Company
    • Wilfried G. Holtje
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...