Patents by Inventor Stephen Perl

Stephen Perl 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).

  • Use of Variable Frequency Microwaves to Control the Teflon Profile of Gas Diffusion Media
    Publication number: 20090211522
    Abstract: A method for fabricating diffusion media for a fuel cell that includes using variable frequency microwaves for heating the diffusion media after it has been coated with a solvent including fluorocarbon particles to provide broader control over the distribution of the fluorocarbon on the diffusion media. In one embodiment, a carbon fiber substrate is dipped in a solution including the fluorocarbon particles and a surfactant. The wet and coated substrate is then dried using the microwave radiation, where the frequency of the microwave radiation is varied to increase or control the dispersion of the fluorocarbon particles and the hydrophobicity of the diffusion media. In one embodiment, the microwave radiation is varied in frequency between 500 MHz and 1000 GHZ.
    Type: Application
    Filed: February 21, 2008
    Publication date: August 27, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Stephen Perl, Anastasios Angelopoulos