Patents by Inventor Yukio Seki

Yukio Seki 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).

  • Magnetic carrier of developer for electrophotographic copying machines composed of ferrite and a selected metal oxide
    Patent number: 4898801
    Abstract: A carrier of developers composed of a composition represented by (MO).sub.X (Fe.sub.2 O.sub.3) having bulk density of 1.8-3.4 g/Cm.sup.3 and magnetization of 10-30 emu/g in a magnetic field of 450-1000 O (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: February 6, 1990
    Assignees: Fuji Xerox Co., Ltd., Nippon Iron Powder Co., Ltd.
    Inventors: Hidekiyo Tachibana, Akihiko Noda, Kazuo Terao, Toshio Honjou, Yukio Seki, Hiroshi Endo, Toshio Yokobari
  • Ferrite carriers for electrophotographic development
    Patent number: 4598034
    Abstract: A carriers for electrophotographic development which comprises essentially a disintegrated powder of granules consisting essentially of the compound represented by the formula(MO).sub.X (Fe.sub.2 O.sub.3).sub.Yin which M is at least one metal selected from the group consisting of Li, Zn, Cd, Cu, Co, and Mg, and X (mol)/Y (mol).ltoreq.0.85.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: July 1, 1986
    Assignee: Nippon Iron Powder Co., Ltd.
    Inventors: Toshio Honjo, Yukio Seki