Patents by Inventor Shouichi Ohkawa

Shouichi Ohkawa 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).

  • Friction body, writing instrument and writing instrument set
    Patent number: 8282299
    Abstract: A friction body that produces frictional heat allowing development, disappearance or change of color of handwriting formed with a writing instrument for producing thermochromic handwriting, with the friction body having a friction coefficient of 0.2 to 1.0 when rubbed against paper surface, and a writing instrument for use in forming thermochromic handwriting which is equipped with the friction body and a writing instrument set including the friction body and a writing instrument for use in forming thermochromic handwriting.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: October 9, 2012
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Yoshihiro Ito, Shouichi Ohkawa, Katsuyuki Fujita
  • FRICTION BODY, WRITING INSTRUMENT AND WRITING INSTRUMENT SET
    Publication number: 20080124164
    Abstract: A friction body that produces frictional heat allowing development, disappearance or change of color of handwriting formed with a writing instrument for producing thermochromic handwriting, with the friction body having a friction coefficient of 0.2 to 1.0 when rubbed against paper surface, and a writing instrument for use in forming thermochromic handwriting which is equipped with the friction body and a writing instrument set including the friction body and a writing instrument for use in forming thermochromic handwriting.
    Type: Application
    Filed: November 28, 2007
    Publication date: May 29, 2008
    Applicant: THE PILOT INK CO., LTD.
    Inventors: Yoshihiro ITO, Shouichi OHKAWA, Katsuyuki FUJITA