Patents by Inventor Thomas Feldkamp

Thomas Feldkamp 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 enrichment or separation of organic substance mixtures
    Patent number: 5152899
    Abstract: Salts of organic carboxylic acids can be separated from non-salt organic compounds using a semipermeable membrane consisting of a perfluorosulfonic acid polymer or a salt of such a polymer, by bringing a solution of the salts and the organic compounds in a C.sub.1 -C.sub.4 alkanol into contact with one side of the membrane and having the pure solvent on the opposite side of the membrane. The process can be used, for example, in purification processes or for recovering reactants from reaction residues.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: October 6, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Joseph Berger, Thomas Feldkamp, Friedrich Lohse, Manfred Muller