Patents by Inventor Siem Le

Siem Le 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).

  • Composite polymer electrolyte membrane for polymer electrolyte membrane fuel cells
    Patent number: 6893763
    Abstract: A polymer electrolyte membrane for a polymer electrolyte membrane fuel cell, which polymer electrolyte membrane has a water-based resin preferably including at least one of vinyl acetate, dextrin and latex.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: May 17, 2005
    Assignee: Gas Technology Institute
    Inventors: Qinbai Fan, Siem Le
  • Air-breathing direct methanol fuel cell with metal foam current collectors
    Patent number: 6797422
    Abstract: A method and apparatus for generating electricity by direct oxidation of methanol in which methanol is passed through a porous anode current collector to contact the anode electrode of a polymer electrolyte membrane fuel cell, an oxidant is passed at atmospheric pressure through a porous cathode current collector which acts as an air diffuser to contact the cathode electrode and the methanol is directly oxidized, producing water which is removed through the cathode current collector, carbon dioxide and electricity.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: September 28, 2004
    Assignee: Gas Technology Institute
    Inventors: Qinbai Fan, Renato Platon, Siem Le, Renata Kot
  • Composite polymer electrolyte membrane for polymer electrolyte membrane fuel cells
    Publication number: 20030194593
    Abstract: A polymer electrolyte membrane for a polymer electrolyte membrane fuel cell, which polymer electrolyte membrane has a water-based resin preferably including at least one of vinyl acetate, dextrin and latex.
    Type: Application
    Filed: May 6, 2002
    Publication date: October 16, 2003
    Inventors: Qinbai Fan, Siem Le
  • Gas diffusion electrode manufacture and MEA fabrication
    Patent number: 6627035
    Abstract: A method for producing a gas diffusion electrode in which a slurry of carbon black, alcohol, water and a tetrafluoroethylene emulsion is applied as a layer a non-Teflonized carbon cloth substrate, which is then heated to remove water. The dried coated carbon cloth is then rolled followed by heating to remove wetting agents present in the tetrafluoroethylene emulsion. The coated carbon cloth is then cooled and rolled again to produce the final end product.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: September 30, 2003
    Assignee: Gas Technology Institute
    Inventors: Qinbai Fan, Siem Le
  • Gas diffusion electrode manufacture and MEA fabrication
    Publication number: 20020134501
    Abstract: A method for producing a gas diffusion electrode in which a slurry of carbon black, alcohol, water and a tetrafluoroethylene emulsion is applied as a layer a non-Teflonized carbon cloth substrate, which is then heated to remove water. The dried coated carbon cloth is then rolled followed by heating to remove wetting agents present in the tetrafluoroethylene emulsion. The coated carbon cloth is then cooled and rolled again to produce the final end product.
    Type: Application
    Filed: January 24, 2001
    Publication date: September 26, 2002
    Inventors: Qinbai Fan, Siem Le
  • Air-breathing direct methanol fuel cell with metal foam current collectors
    Publication number: 20020098402
    Abstract: A method and apparatus for generating electricity by direct oxidation of methanol in which methanol is passed through a porous anode current collector to contact the anode electrode of a polymer electrolyte membrane fuel cell, an oxidant is passed at atmospheric pressure through a porous cathode current collector which acts as an air diffuser to contact the cathode electrode and the methanol is directly oxidized, producing water which is removed through the cathode current collector, carbon dioxide and electricity.
    Type: Application
    Filed: September 5, 2001
    Publication date: July 25, 2002
    Inventors: Qinbai Fan, Renato Platon, Siem Le, Renata Kot
  • Method of preventing the reinfestation of dogs and cats by fleas
    Patent number: 4973589
    Abstract: The present invention relates to a method of treating dogs and cats having topically disposed fleas. More particularly, the invention relates to such a method of treatment wherein the dog or cat is dosed with a larvicidally or ovicidally effective amount of flea growth inhibiting substance capable of reaching the flea via the hosts blood.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: November 27, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: Sharron H. Barnett, Roland H. Johnson, Douglas I. Hepler