Patents by Inventor Klaus-Dieter Ginzel

Klaus-Dieter Ginzel 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 recovery of perfluoroethercarboxylic acids
    Patent number: 5196579
    Abstract: The invention relates to a process for the recovery of perfluoroethercarboxylic acids from the crude product of the electrochemical conversion of these acids or of one of their soluble salts to perfluorinated ethers, in which the perfluoroethercarboxylic acids and their esters contained in the crude product are separated off with the aid of a solid basic alkali metal salt or its solution and converted, by reaction of the resulting salts with a strong acid, to the corresponding perfluoroethercarboxylic acids.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: March 23, 1993
    Assignee: Hoechst AG
    Inventors: Thomas Gries, Klaus-Dieter Ginzel, Frank Ebmeyer