Patents by Inventor Toshio Kumiyama

Toshio Kumiyama 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).

  • Printer guide member
    Patent number: 4720201
    Abstract: A printer guide member for guiding print wires in a dot matrix printer, which comprises a thin ceramic sintered body containing 60% by weight or more of Si.sub.3 N.sub.4 and having a plurality of guide holes perforated therethrough. In addition to Si.sub.3 N.sub.4, this thin ceramic sintered body further includes (a) not more 10% by weight of Al.sub.2 O.sub.3 and (B) at least one component as an additive selected from the group consisting of (i) not more than 10% by weight of a rare earth element oxide, (ii) not more than 10% by weight of AlN, and (iii) not more than 10% by weight of at least one oxide selected from the group consisting of TiO.sub.2, MgO and ZrO.sub.2.
    Type: Grant
    Filed: September 19, 1985
    Date of Patent: January 19, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyoshi Nakamura, Syozi Okada, Toshio Kumiyama