Patents by Inventor Sonia Geillis Wong-Cheung

Sonia Geillis Wong-Cheung 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).

  • Fluid diffusion layers for fuel cells
    Publication number: 20040058229
    Abstract: Fluid diffusion layers with favorable mechanical and electrical properties are prepared for fuel cell electrodes by impregnating a porous carbonaceous web with a carbonizable polymer having pyrrolidone functionality and then carbonizing the pyrrolidone polymer. The polymer having pyrrolidone functionality is stabilized against vaporization by use of an oxidization step prior to carbonization. The fluid diffusion layers are particularly suitable for use as gas diffusion layers in solid polymer electrolyte fuel cells.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 25, 2004
    Inventors: Paul D. Beattie, David P. Wilkinson, Paul Kozak, Haijiang Wang, Sheilah Neumann, John Robert Gordon, Kelvin Keen-Ven Fong, Sonia Geillis Wong-Cheung, Michael Todd Davis, Bien Chiem, Lynn C. Erickson
  • Fluid diffusion layers for fuel cells
    Patent number: 6667127
    Abstract: Fluid diffusion layers with favorable mechanical and electrical properties are prepared for fuel cell electrodes by impregnating a porous carbonaceous web with a carbonizable polymer having pyrrolidone functionality and then carbonizing the pyrrolidone polymer. The polymer having pyrrolidone functionality is stabilized against vaporization by use of an oxidization step prior to carbonization. The fluid diffusion layers are particularly suitable for use as gas diffusion layers in solid polymer electrolyte fuel cells.
    Type: Grant
    Filed: September 13, 2001
    Date of Patent: December 23, 2003
    Assignee: Ballard Power Systems Inc.
    Inventors: Paul D. Beattie, David P. Wilkinson, Paul Kozak, Haijiang Wang, Sheilah Neumann, John Robert Gordon, Kelvin Keen-Ven Fong, Sonia Geillis Wong-Cheung, Michael Todd Davis, Bien Chiem, Lynn C. Erickson
  • Fluid diffusion layers for fuel cells
    Publication number: 20030008195
    Abstract: Fluid diffusion layers, as well as methods and compositions for making such fluid diffusion layers, include a loading material comprising both carbon black and graphite particles in a weight ratio of less than about 50:50. The fluid diffusion layers have favorable mechanical and electrical properties, such as air flow and through-plane resistance.
    Type: Application
    Filed: June 21, 2002
    Publication date: January 9, 2003
    Inventors: Bien Hung Chiem, Herwig Robert Haas, Jurgen Stumper, Kelvin Keen-Ven Fong, Sonia Geillis Wong-Cheung, Hong Cao, Paul Kozak, Michael Todd Davis
  • Fluid diffusion layers for fuel cells
    Publication number: 20020058180
    Abstract: Fluid diffusion layers with favorable mechanical and electrical properties are prepared for fuel cell electrodes by impregnating a porous carbonaceous web with a carbonizable polymer having pyrrolidone functionality and then carbonizing the pyrrolidone polymer. The polymer having pyrrolidone functionality is stabilized against vaporization by use of an oxidization step prior to carbonization. The fluid diffusion layers are particularly suitable for use as gas diffusion layers in solid polymer electrolyte fuel cells.
    Type: Application
    Filed: September 13, 2001
    Publication date: May 16, 2002
    Inventors: Paul D. Beattie, David P. Wilkinson, Paul Kozak, Haijiang Wang, Sheilah Neumann, John Robert Gordon, Kelvin Keen-Ven Fong, Sonia Geillis Wong-Cheung, Michael Todd Davis, Bien Chiem, Lynn C. Erickson