Patents by Inventor Yusuke Karima

Yusuke Karima 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).

  • Carrier for electrophotography and developing material for electrophotography using same
    Patent number: 5919593
    Abstract: The invention relates to a carrier for electrophotography comprising a carrier core material covered with a polymeric polyolefin-based resin. Such a carrier is used that the carrier core material content accounts for 90% by weight or more of the carrier and he carrier surface has a shape factor S(smoothness) satisfying the relation, 100.ltoreq.S<130, when represented by the following equation (I):S=(L.sup.2 /A).times.(1/4.pi.).times.100 (I),(where L designates an average value of an outer periphery of a projection of the carrier and A designates an average value of a projected area of the carrier).
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: July 6, 1999
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Yusuke Karima, Kazuo Murakata, Hiroshi Matsuo