Patents by Inventor Karen Leanne Hogarth

Karen Leanne Hogarth 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).

  • Gas diffusion substrate
    Patent number: 7049025
    Abstract: A novel flexible non-woven carbon fibre gas diffusion substrate comprising a plurality of first carbon fibres orientated in the x-, y- and optionally z-directions, said first fibres being bonded with a thermoplastic polymeric substance, and a carbon based filler material, characterised, in that the flexible non-woven carbon fibre gas diffusion substrate has a total density of greater than 0.35 g/cm3, and a gas diffusion electrode obtained therefrom is disclosed. Also disclosed is a process for the manufacture of the substrate and electrode.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: May 23, 2006
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Susan Joy Cooper, John Malcolm Gascoyne, Thomas Robertson Ralph, Karen Leanne Hogarth
  • Gas diffusion substrate
    Patent number: 6949308
    Abstract: A fuel cell gas diffusion substrate has primary fibres, secondary fibres and one or more thermoplastic polymers for binding the primary and secondary fibres, characterized in that the secondary fibers are in the form of carbon nanofibers, and a gas diffusion electrode and membrane electrode assembly prepared therefrom are disclosed.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: September 27, 2005
    Assignees: Johnson Matthey Public Limited Company, Technical Fibre Products Limited
    Inventors: John Malcolm Gascoyne, Graham Alan Hards, Karen Leanne Hogarth, Thomas Robertson Ralph, Stephen John Edwards, Nigel Julian Walker
  • Gas diffusion substrate
    Publication number: 20040058123
    Abstract: A novel flexible non-woven carbon fibre gas diffusion substrate comprising a plurality of first carbon fibres orientated in the x-, y- and optionally z-directions, said first fibres being bonded with a thermoplastic polymeric substance, and a carbon based filler material, characterised, in that the flexible non-woven carbon fibre gas diffusion substrate has a total density of greater than 0.35 g/cm3, and a gas diffusion electrode obtained therefrom is disclosed. Also disclosed is a process for the manufacture of the substrate and electrode.
    Type: Application
    Filed: September 18, 2003
    Publication date: March 25, 2004
    Inventors: Susan Joy Cooper, John Malcolm Gascoyne, Thomas Robertson Ralph, Karen Leanne Hogarth
  • Gas diffusion substrate
    Publication number: 20030134179
    Abstract: A fuel cell gas diffusion substrate comprising primary fibres, secondary fibres and one or more thermoplastic polymers for binding said primary and secondary fibres, characterised in that said secondary carbon fibres are in the form of carbon nanofibres, and a gas diffusion electrode and membrane electrode assembly prepared therefrom are disclosed.
    Type: Application
    Filed: October 16, 2002
    Publication date: July 17, 2003
    Inventors: John Malcolm Gascoyne, Graham Alan Hards, Karen Leanne Hogarth, Thomas Robertson Ralph, Stephen John Edwards, Nigel Julian Walker