Patents by Inventor Wilhelmus Johannen Weigers

Wilhelmus Johannen Weigers 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).

  • Patent number: 4061686
    Abstract: Described is a mixture of cyclohexane diol intermediates produced while carrying out a process wherein a mixture of compounds having a sandalwood aroma is prepared, which process comprises;1. Reacting catechol with camphene in the presence of a Friedel Crafts Catalyst to form a first alkylation product; and then2. Treating said first alkylation product with hydrogen in the presence of a hydrogenation catalyst, thus forming, initially, the diol intermediates of our invention and then, on continuing the hydrogenation, the mixture useful in perfumery.
    Type: Grant
    Filed: December 22, 1976
    Date of Patent: December 6, 1977
    Assignee: International Flavors & Fragrances Inc.
    Inventors: John B. Hall, Wilhelmus Johannen Weigers