Patents by Inventor Friedrich Ische

Friedrich Ische has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of polyhalo copper phthalocyanines
    Patent number: 4002642
    Abstract: Polyhalo copper phthalocyanines are obtained by reacting a di- to tetrahalo phthalic acid or a derivative thereof, if necessary urea, a copper salt, a titanium tetrahalide and a compound capable of forming an addition compound with said titanium tetrahalide. The purification of the so-obtained products is much easier since lower amounts of titanium compounds can be used. The products are useful as pigments.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: January 11, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Friedrich Ische, Ernst Spietschka
  • Process for the purification of crude polyhalo copper phthalocyanines
    Patent number: 3974177
    Abstract: Polyhalo copper phthalocyanines are purified in concentrated sulfuric acid under addition of peroxo compounds including addition compounds of hydrogen peroxide. The products are useful as pigments having very pure green shades and good fastness properties.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: August 10, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Friedrich Ische, Ernst Spietschka