Patents by Inventor Tanja Zeif

Tanja Zeif 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).

  • Method of purifying a dispersion of ionic fluoropolymer
    Patent number: 7304101
    Abstract: Anionic species are removed from aqueous dispersions of ionic fluoropolymers using anion exchange resins. In some embodiments, cationic species are also removed using cation exchange resins.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: December 4, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Klaus Hintzer, Kai H. Lochhaas, Tanja Zeif, Steven J. Hamrock, Harold T. Freemyer
  • Method of hydrolyzing a dispersion of ionic fluoropolymer
    Publication number: 20060014887
    Abstract: Aqueous dispersions of fluoropolymers having fluorosulfonyl groups are hydrolyzed to form dispersions of ionic fluoropolymers by addition of base.
    Type: Application
    Filed: July 19, 2004
    Publication date: January 19, 2006
    Inventors: Steven Hamrock, Klaus Hintzer, Kai Lochhaas, Tanja Zeif, Harold Freemyer
  • Method of purifying a dispersion of ionic fluoropolymer
    Publication number: 20060014886
    Abstract: Anionic species are removed from aqueous dispersions of ionic fluoropolymers using anion exchange resins. In some embodiments, cationic species are also removed using cation exchange resins.
    Type: Application
    Filed: July 19, 2004
    Publication date: January 19, 2006
    Inventors: Klaus Hintzer, Kai Lochhaas, Tanja Zeif, Steven Hamrock, Harold Freemyer