Patents by Inventor Jung Mi Gwak

Jung Mi Gwak 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).

  • Carbon substrate for gas diffusion layer, gas diffusion layer using the same, and electrode for fuel cell, membrane-electrode assembly and fuel cell comprising the gas diffusion layer
    Patent number: 9692070
    Abstract: A carbon substrate for a gas diffusion layer that has a porosity gradient in a thickness direction thereof, a gas diffusion using the carbon substrate, an electrode and a membrane-electrode assembly for a fuel cell that include the gas diffusion layer, and a fuel cell including the membrane-electrode assembly having the gas diffusion layer are provided. The gas diffusion layer has improved water discharge ability and improved bending strength both in the machine direction and cross-machine direction.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: June 27, 2017
    Assignees: JNTG Co., Ltd., JNTC Co., Ltd.
    Inventors: Eun Sook Lee, Do Hun Kim, Eun Chong Kim, Jy Young Jyoung, Jung Mi Gwak, Sang Jin Choi, Tae Nyun Kim, Jung Kyu Lee
  • Method of preparing carbon substrate for gas diffusion layer of polymer electrolyte fuel cell, carbon substrate prepared by using the method, and system for manufacturing the same
    Patent number: 8747796
    Abstract: A carbon substrate, method, and a system for manufacturing the same. The method includes forming an oxidized carbon precursor fiber preweb comprising oxidized carbon precursor staple fibers and binder staple fibers; impregnating the oxidized carbon precursor fiber preweb with a slurry including a thermosetting resin and carbonaceous fillers and drying the resulting preweb to obtain an oxidized carbon precursor fiber web; applying heat and pressure to the oxidized and impregnated carbon precursor fiber web, to cure the thermosetting resin and press the oxidized carbon precursor fiber web; and heating the oxidized carbon precursor fiber web in an inert atmosphere, thereby stabilizing and carbonizing the oxidized carbon precursor staple fibers to obtain a carbon substrate. The present invention may utilize a combination of carbon precursor staple fibers in an oxidized form with low ductility and high stiffness; and binder staple fibers composed of a polymer resin.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: June 10, 2014
    Assignee: Hyup Jin I&C Co., Ltd.
    Inventors: Chang Woo Lee, Eun Sook Lee, Jy Young Jyoung, Do Hun Kim, Yong Won Jin, Jung Mi Gwak, Young Uk Jyoung
  • Carbon Substrate For Gas Diffusion Layer, Gas Diffusion Layer Using The Same, And Electrode For Fuel Cell, Membrane-Electrode Assembly And Fuel Cell Comprising The Gas Diffusion Layer
    Publication number: 20140011118
    Abstract: A carbon substrate for a gas diffusion layer that has a porosity gradient in a thickness direction thereof, a gas diffusion using the carbon substrate, an electrode and a membrane-electrode assembly for a fuel cell that include the gas diffusion layer, and a fuel cell including the membrane-electrode assembly having the gas diffusion layer are provided. The gas diffusion layer has improved water discharge ability and improved bending strength both in the machine direction and cross-machine direction.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 9, 2014
    Applicants: JNTG Co., Ltd., JNTC Co., Ltd.
    Inventors: Eun Sook Lee, Do Hun Kim, Eun Chong Kim, Jy Young Jyoung, Jung Mi Gwak, Sang Jin Choi, Tae Nyun Kim, Jung Kyu Lee
  • Method Of Preparing Carbon Substrate For Gas Diffusion Layer Of Polymer Electrolyte Fuel Cell, Carbon Substrate Prepared By Using The Method, And System For Manufacturing The Same
    Publication number: 20110286910
    Abstract: A carbon substrate, method, and a system for manufacturing the same. The method includes forming an oxidized carbon precursor fiber preweb comprising oxidized carbon precursor staple fibers and binder staple fibers; impregnating the oxidized carbon precursor fiber preweb with a slurry including a thermosetting resin and carbonaceous fillers and drying the resulting preweb to obtain an oxidized carbon precursor fiber web; applying heat and pressure to the oxidized and impregnated carbon precursor fiber web, to cure the thermosetting resin and press the oxidized carbon precursor fiber web; and heating the oxidized carbon precursor fiber web in an inert atmosphere, thereby stabilizing and carbonizing the oxidized carbon precursor staple fibers to obtain a carbon substrate. The present invention may utilize a combination of carbon precursor staple fibers in an oxidized form with low ductility and high stiffness; and binder staple fibers composed of a polymer resin.
    Type: Application
    Filed: May 20, 2011
    Publication date: November 24, 2011
    Inventors: Chang Woo Lee, Eun Sook Lee, Jy Young Jyoung, Do Hun Kim, Yong Won Jin, Jung Mi Gwak, Young Uk Jyoung