Patents by Inventor Margaret Fleming

Margaret Fleming 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 preparing gas diffusion media for a fuel cell
    Patent number: 9023556
    Abstract: Diffusion media for fuel cell is made by preparing an aqueous dispersion comprising a powder resin, a binder material, and a fiber material comprising carbon fibers, of these; forming a layer of the dispersion on a support; removing water from the layer to form a fiber layer; molding the fiber layer; and carbonizing or graphitizing the molded layer.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: May 5, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Chunxin Ji, Mark Mathias, Margaret Fleming
  • Acrylic fiber bonded carbon fiber paper as gas diffusion media for fuel cell
    Patent number: 8343452
    Abstract: A gas diffusion media for a fuel cell, such as a proton exchange membrane fuel cell, is provided. The gas diffusion media includes carbonizable acrylic pulp fibers instead of conventional phenolic resin as a binder material. The acrylic fibers are mixed with the carbon fiber dispersion during the papermaking step, thus eliminating the phenolic resin impregnation step typically associated with conventional gas diffusion media manufacturing processes. The mat is then cured and carbonized to produce gas diffusion media.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: January 1, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Chunxin Ji, Gerald J. Fleming, Margaret Fleming, legal representative, Mark Mathias
  • Acrylic fiber bonded carbon fiber paper as gas diffusion media for fuel cell
    Publication number: 20070218346
    Abstract: A gas diffusion media for a fuel cell, such as a proton exchange membrane fuel cell, is provided. The gas diffusion media includes carbonizable acrylic pulp fibers instead of conventional phenolic resin as a binder material. The acrylic fibers are mixed with the carbon fiber dispersion during the papermaking step, thus eliminating the phenolic resin impregnation step typically associated with conventional gas diffusion media manufacturing processes. The mat is then cured and carbonized to produce gas diffusion media.
    Type: Application
    Filed: March 20, 2006
    Publication date: September 20, 2007
    Inventors: Chunxin Ji, Gerald Fleming, Margaret Fleming, Mark Mathias
  • Gas diffusion media and fuel cell
    Publication number: 20070218343
    Abstract: Diffusion media for fuel cell is made by preparing an aqueous dispersion comprising a powder resin, a binder material, and a fiber material comprising carbon fibers, of these; forming a layer of the dispersion on a support; removing water from the layer to form a fiber layer; molding the fiber layer; and carbonizing or graphitizing the molded layer.
    Type: Application
    Filed: March 17, 2006
    Publication date: September 20, 2007
    Inventors: Chunxin Ji, Gerald Fleming, Margaret Fleming, Mark Mathias