Patents by Inventor Yumiko Yokouchi

Yumiko Yokouchi 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).

  • Solid electrolytic capacitor and method for manufacturing the same
    Patent number: 6731497
    Abstract: A solid electrolytic capacitor is manufactured by repeating a plurality of times a first step of immersing a substrate made of a valve metal whose surface is roughened and which is formed with an insulating oxide film in an ethylene dioxythiophene solution and a second step of bringing the substrate into contact with an oxidizing agent solution containing quadrivalent cerium salt at a concentration of 1% to 7% by weight so that the cumulative total time during which the second step is performed is shorter than five minutes, thereby forming a solid high molecular polymer electrolyte layer on the surface of the substrate.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: May 4, 2004
    Assignee: TDK Corporation
    Inventors: Yumiko Yokouchi, Masaaki Kobayashi
  • Solid electrolytic capacitor and a method for manufacturing the same
    Publication number: 20030107870
    Abstract: According to the present invention, a solid electrolytic capacitor is manufactured by repeating a plurality of times a first step of immersing a substrate made of a valve metal whose surface is roughened and which is formed with an insulating oxide film in an ethylene dioxythiophene solution and a second step of bringing the substrate into contact with an oxidizing agent solution containing quadrivalent cerium salt at a concentration of 1% to 7% by weight so that the cumulative total time during which the second step is performed is shorter than five minutes, thereby forming a solid high molecular polymer electrolyte layer on the surface of the substrate.
    Type: Application
    Filed: July 10, 2002
    Publication date: June 12, 2003
    Applicant: TDK Corporation
    Inventors: Yumiko Yokouchi, Masaaki Kobayashi