Patents by Inventor Miriam STIEFEL

Miriam STIEFEL 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).

  • Reduction of cell degradation in fuel cell systems
    Patent number: 11322758
    Abstract: A method for reducing cell degradation in a fuel cell system includes adding oxygen-containing gas to a fuel in the anode chamber to prevent an increase in a cell voltage above a predetermined maximum value.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: May 3, 2022
    Assignees: VOLKSWAGEN AG, AUDI AG
    Inventors: Miriam Stiefel, Lasse Schmidt, Gerold Hübner
  • Membrane electrode assembly for a fuel cell, and fuel cell
    Patent number: 10991965
    Abstract: The invention relates to a membrane electrode assembly (15) for a fuel cell (10), comprising a membrane (11) on each side of which is disposed a catalytic layer (12, 13), and on this a gas diffusion layer (30). It is provided that the gas diffusion layer (30) comprises a layer with electrically conductive particles (35), and a portion of the particles (35) is arranged directly adjacent to the catalytic layer (12, 13).
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: April 27, 2021
    Assignees: Volkswagen AG, Audi AG
    Inventors: Lasse Schmidt, Martin Göbel, Miriam Stiefel, Julian Ronnenberg
  • REDUCTION OF CELL DEGRADATION IN FUEL CELL SYSTEMS
    Publication number: 20210091392
    Abstract: A method for reducing cell degradation in a fuel cell system includes adding oxygen-containing gas to a fuel in the anode chamber to prevent an increase in a cell voltage above a predetermined maximum value.
    Type: Application
    Filed: January 23, 2019
    Publication date: March 25, 2021
    Inventors: Miriam STIEFEL, Lasse SCHMIDT, Gerold HÜBNER
  • MEMBRANE ELECTRODE ASSEMBLY FOR A FUEL CELL, AND FUEL CELL
    Publication number: 20180233758
    Abstract: The invention relates to a membrane electrode assembly (15) for a fuel cell (10), comprising a membrane (11) on each side of which is disposed a catalytic layer (12, 13), and on this a gas diffusion layer (30). It is provided that the gas diffusion layer (30) comprises a layer with electrically conductive particles (35), and a portion of the particles (35) is arranged directly adjacent to the catalytic layer (12, 13).
    Type: Application
    Filed: August 10, 2016
    Publication date: August 16, 2018
    Applicants: Volkswagen AG, Audi AG
    Inventors: Lasse SCHMIDT, Martin GÖBEL, Miriam STIEFEL, Julian RONNENBERG