Patents Assigned to TDK Electronics, Ltd.
  • Ferrite powder type magnetic toner used in electrophotography and process for producing the same
    Patent number: 4282302
    Abstract: A ferrite powder type magnetic toner used in an electrophotography. It comprises a resinous component and a ferrite having a spinel structure comprising components of iron oxide at a ratio of 99.9 to 51 mole % as Fe.sub.2 O.sub.3 and at least one metal oxide selected from the group consisting of manganese oxide, nickel oxide, cobalt oxide, magnesium oxide, copper oxide, zinc oxide and cadmium oxide at a ratio of 0.1 to 49 mole % as MO wherein M represents Ni, Co, Mg, Cu, Zn or Cd.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: August 4, 1981
    Assignee: TDK Electronics, Ltd.
    Inventors: Motohiko Makino, Kenji Imamura, Yoshinori Kurosawa