Patents by Inventor Joachim Kiefer

Joachim Kiefer 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).

  • Polyazole-based polymer films
    Publication number: 20040262227
    Abstract: The present invention relates to polymer films and a polymer membrane having an improved mechanical property profile produced therefrom, to a process for producing them and to their use.
    Type: Application
    Filed: August 5, 2004
    Publication date: December 30, 2004
    Inventors: Joachim Kiefer, Oemer Uensal, Jochen Baurmeister, Frauke Jordt
  • Polymer membrane, method for the production and use thereof
    Publication number: 20040247974
    Abstract: The present invention relates to an acid-doped polymer membrane based on polyazoles, a process for producing it and its use.
    Type: Application
    Filed: June 21, 2004
    Publication date: December 9, 2004
    Inventors: Oemer Uensal, Joachim Kiefer, Jochen Baurmeister, Jurgen Pawlik, Werner Kraus, Frauke Jordt
  • Novel membranes having improved mechanical properties, for use in fuel cells
    Publication number: 20040131909
    Abstract: The invention relates to an acid-doped, single-layer or multilayer polymer membrane comprising at least one layer A of a polymer blend comprising
    Type: Application
    Filed: February 10, 2004
    Publication date: July 8, 2004
    Inventors: Thomas Soczka-Guth, Joachim Kiefer, Frauke Jordt
  • Proton-conducting membrane and use thereof
    Publication number: 20040127588
    Abstract: The present invention relates to a novel proton-conducting polymer membrane based on polyazoles which can, because of its excellent chemical and thermal properties, be used in a variety of ways and is particularly useful as polymer electrolyte membrane (PEM) to produce membrane electrode units for PEM fuel cells.
    Type: Application
    Filed: February 10, 2004
    Publication date: July 1, 2004
    Inventors: Gordon Calumdann, Michael J Sansone, Oemer Uensal, Joachim Kiefer
  • Method for producing a membrane made of bridged polymer and a fuel cell
    Publication number: 20040118773
    Abstract: The present invention relates to a membrane comprising a bridged polymer which is produced by a selected process. The membrane of the invention displays a significantly improved fracture toughness (elongation at break/tensile strength) with virtually unchanged swelling behavior.
    Type: Application
    Filed: September 25, 2003
    Publication date: June 24, 2004
    Inventors: Oemer Uensal, Joachim Kiefer
  • Proton-comducting membrane and the use thereof
    Publication number: 20040096734
    Abstract: The present invention relates to a novel proton-conducting polymer membrane based on polyazoles which can, because of its excellent chemical and thermal properties, be used in a variety of ways and is particularly useful as polymer electrolyte membrane (PEM) to produce membrane electrode units for PEM fuel cells.
    Type: Application
    Filed: December 24, 2003
    Publication date: May 20, 2004
    Inventors: Gordon Calundann, Michael J. Sansone, Oemer Uensal, Joachim Kiefer