Patents by Inventor Hirofumi Kamitakahara

Hirofumi Kamitakahara 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 of and apparatus for preparing optical recording medium substrates
    Patent number: 5147592
    Abstract: A process for preparing a substrate sheet for optical recording mediums includes the steps of extruding a molten resin to form a resin sheet and bringing the resin sheet into pressure between a preformat roll and a roll disposed opposingly to said preformat roll to transfer a preformat pattern to the surface of the resin sheet, wherein the roll disposed opposingly to the preformat roll includes a roll whose surface is covered with an elastomeric resin.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: September 15, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Sato, Osamu Kanome, Hitoshi Yoshino, Hirofumi Kamitakahara, Hisanori Hayashi, Tsuyoshi Santoh