Patents by Inventor Ariane Higel

Ariane Higel 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).

  • Purification of 2-aryl-2H-benzotriazoles
    Patent number: 5097041
    Abstract: There is disclosed a process in which a melt of a 2-aryl-2H-benzotriazole containing colored contaminants, or a solution thereof in an organic nonpolar solvent, is purified by treatment with a strongly acidic synthetic cationic exchange resin.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: March 17, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Ariane Higel, Sebastian Staubli, Daniel Thibaut, Hans Horisberger