Patents by Inventor Misao Ooyama

Misao Ooyama 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).

  • Ballpoint pen
    Patent number: 9533528
    Abstract: A ballpoint pen 10 includes: a ballpoint pen tip 20 having a writing ball 30 and a holder 21 holding the writing ball 30; a shaft tube 12 to which the rear end part of the ballpoint pen tip 20 is mounted; and ink 40 accommodated in the shaft tube 12. The holder 21 has an ink guiding hole 26 formed from the rear end thereof toward the head end thereof and a ball house 22 formed with the inner circumference near the head end of the holder 21 expanded. The writing ball 30 is formed of a zirconia sintered body with the content of an aluminum element being less than 0.1 weight %, and the ink 40 contains inorganic particles 41.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: January 3, 2017
    Assignee: MITSUBISHI PENCIL COMPANY, LIMITED
    Inventors: Yoshihisa Osano, Yoshihide Ishii, Misao Ooyama, Saki Hanatani
  • BALLPOINT PEN
    Publication number: 20150078803
    Abstract: A ballpoint pen 10 includes: a ballpoint pen tip 20 having a writing ball 30 and a holder 21 holding the writing ball 30; a shaft tube 12 to which the rear end part of the ballpoint pen tip 20 is mounted; and ink 40 accommodated in the shaft tube 12. The holder 21 has an ink guiding hole 26 formed from the rear end thereof toward the head end thereof and a ball house 22 formed with the inner circumference near the head end of the holder 21 expanded. The writing ball 30 is formed of a zirconia sintered body with the content of an aluminum element being less than 0.1 weight %, and the ink 40 contains inorganic particles 41.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 19, 2015
    Applicant: MITSUBISHI PENCIL COMPANY, LIMITED
    Inventors: Yoshihisa Osano, Yoshihide Ishii, Misao Ooyama, Saki Hanatani