Patents by Inventor Thomas Gessner

Thomas Gessner 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).

  • Preparation of DI- or triarylmethane dyes by oxidation
    Patent number: 5347022
    Abstract: A process for preparing di- or triarylmethane dyes by oxidation of di- or triarylmethanes in the presence of a diluent and of an oxygen transfer catalyst that contains a complexed heavy metal ion or of a catalyst based on molybdenic acid and vanadium compounds comprises using as oxidizing agent peroxomonosulfuric acid or a salt thereof.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: September 13, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Thomas Gessner, Udo Mayer