Patents by Inventor Suehiko Miura

Suehiko Miura 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).

  • Black magnetic iron oxide particles and magnetic toner
    Patent number: 6780555
    Abstract: Black magnetic iron oxide particles having an average particle diameter of 0.05 to 1.0 &mgr;m have a three-phase structure comprising: a core portion containing at least one metal element other than Fe selected from the group consisting of Mn, Zn, Cu, Ni, Cr, Cd, Sn, Mg, Ti, Ca and Al in an amount of 0.1 to 10% by weight based on whole Fe contained in the particles; a surface coat portion containing at least one metal element other than Fe selected from the group consisting of Mn, Zn, Cu, Ni, Cr, Cd, Sn, Mg, Ti, Ca and Al in an amount of 0.1 to 10% by weight based on whole Fe contained in the particles; and an intermediate layer disposed between the core portion and the surface coat portion, containing substantially none of the metal elements other than Fe.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: August 24, 2004
    Assignee: Toda Kogyo Corporation
    Inventors: Naoki Uchida, Minoru Kouzawa, Hiromitsu Misawa, Koso Aoki, Suehiko Miura
  • Black magnetic iron oxide particles and magnetic toner
    Publication number: 20020168523
    Abstract: Black magnetic iron oxide particles having an average particle diameter of 0.05 to 1.
    Type: Application
    Filed: January 22, 2002
    Publication date: November 14, 2002
    Inventors: Naoki Uchida, Minoru Kouzawa, Hiromitsu Misawa, Koso Aoki, Suehiko Miura
  • Black magnetic iron oxide particles for magnetic toner and process for producing the same
    Patent number: 6383637
    Abstract: Black magnetic iron oxide particles of the present invention having an average particle diameter of 0.1 to 0.3 &mgr;m, comprise: black spinel iron oxide particles as core particles; and a surface coat formed on the surface of each core particle, comprising fine spinel iron oxide particles, the content of FeO in a surface layer having a thickness of from a surface of each black magnetic iron oxide particle to about 3.5% per a radius of each black magnetic iron oxide particle, being 8 to 14% by weight based on the weight of Fe contained in said surface layer. Such black magnetic iron oxide particles not only have a sufficient blackness and excellent electrical properties, flowability and electrification property (charging property), but also exhibit a good compatibility with binder resins such as aromatic vinyl-based resins, acrylic-based resins and copolymer resins thereof, and a good dispersibility in these resins for a magnetic toner.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: May 7, 2002
    Assignee: Toda Kogyo Corporation
    Inventors: Hiromitsu Misawa, Koso Aoki, Suehiko Miura, Minoru Kozawa, Naoki Uchida, Nobuya Shimo