Patents by Inventor Christine Schwer

Christine Schwer 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 sulfonated arylphosphines
    Patent number: 5684181
    Abstract: The sulfonation of arylphosphines, which contain at least one aromatic radical which can be sulfonated, is carried out with an anhydrous mixture of sulfuric acid and orthoboric acid. By choosing the appropriate reaction temperature, the process allows selective introduction of the desired number of sulfonic acid radicals into the phosphine molecule and avoids the formation of phosphine oxides. When separating the sulfonation mixture, the orthoboric acid can be separated off together with the sulfuric acid.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: November 4, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Guido Albanese, Rainer Manetsberger, Wolfgang A. Herrmann, Christine Schwer