Patents by Inventor Shintaro Hirakawa

Shintaro Hirakawa 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).

  • Disk cartridge with lubricating means in contact with spindle of drive means
    Patent number: 5241441
    Abstract: In a disk cartridge of the invention, a lubricating polymer film as a resin in which a solid lubricant or a reinforcing material is dispersed is arranged in a case near the center hole of a disk. Since this lubricating polymer film is hardly abraded even with a disk whose number of revolutions per unit time is high, almost no dust is generated. Therefore, a disk cartridge with higher reliability can be provided.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: August 31, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Yamada, Yutaka Murano, Shintaro Hirakawa, Akio Suzuki
  • Disk cartridge with lubricating means in contact with spindle of drive means
    Patent number: 5103363
    Abstract: In a disk cartridge of the invention, a lubricating polymer film as a resin in which a solid lubricant or a reinforcing material is dispersed is arranged in a case near the center hole of a disk. Since this lubricating polymer film is hardly abraded even with a disk whose number of revolutions per unit time is high, almost no dust is generated. Therefore, a disk cartridge with higher reliability can be provided.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: April 7, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Yamada, Yutaka Murano, Shintaro Hirakawa, Akio Suzuki