Patents by Inventor Kumie Yamana

Kumie Yamana 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).

  • Process for production of electret material
    Patent number: 8747961
    Abstract: Provided is a process by which an electret material having excellent thermal resistance of charge retentivity can be obtained. The process for producing an electret material of the invention includes an irradiation step, a formation step, and a charging step. In the irradiation step, a dispersion containing fine polytetrafluoroethylene particles is irradiated with ? rays. In the formation step, the dispersion which has been irradiated with ? rays is applied to an electrode plate and then dried, and the fine polytetrafluoroethylene particles are sintered to form a polytetrafluoroethylene layer on the electrode plate. In the charging step, the surface of the polytetrafluoroethylene layer is subjected to a charging treatment.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: June 10, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Seiichi Takaoka, Kumie Yamana
  • PROCESS FOR PRODUCTION OF ELECTRET MATERIAL
    Publication number: 20110229655
    Abstract: Provided is a process by which an electret material having excellent thermal resistance of charge retentivity can be obtained. The process for producing an electret material of the invention includes an irradiation step, a formation step, and a charging step. In the irradiation step, a dispersion containing fine polytetrafluoroethylene particles is irradiated with ? rays. In the formation step, the dispersion which has been irradiated with ? rays is applied to an electrode plate and then dried, and the fine polytetrafluoroethylene particles are sintered to form a polytetrafluoroethylene layer on the electrode plate. In the charging step, the surface of the polytetrafluoroethylene layer is subjected to a charging treatment.
    Type: Application
    Filed: April 13, 2010
    Publication date: September 22, 2011
    Applicant: NITTO DENKO CORPORATION
    Inventors: Seiichi Takaoka, Kumie Yamana