Patents by Inventor Jean-Claud Wilhelm

Jean-Claud Wilhelm 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).

  • Phthalimidyl azo dyes, process for the preparation thereof and the use thereof
    Patent number: 7087731
    Abstract: The present invention relates to dyes of formula wherein R1 is hydrogen, methyl or —BHCO—C1–C4alkyl, R2 is C1–C4alkyl, it being possible for the alkyl chain, from C2 upwards, optionally to be interrupted by an oxygen atom, and R3 has, independent of R2, any of the meanings of R2, and to the process for the preparation thereof and to the use thereof in dyeing or printing semi-synthetic and especially synthetic hydmophobic fiber materials, especially textile materials.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: August 8, 2006
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Antoine Clément, Jean-Claud Wilhelm, Alfons Arquint, Urs Lauk