Patents by Inventor Yukihiro Matsuda

Yukihiro Matsuda 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).

  • Ferrite particles and electrophotographic development carrier using same, electrophotographic developer and method of manufacturing ferrite particles
    Patent number: 9507285
    Abstract: There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 ?m, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 ?m. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: November 29, 2016
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Takeshi Kawauchi, Shou Ogawa, Yukihiro Matsuda
  • FERRITE PARTICLES AND ELECTROPHOTOGRAPHIC DEVELOPMENT CARRIER USING SAME, ELECTROPHOTOGRAPHIC DEVELOPER AND METHOD OF MANUFACTURING FERRITE PARTICLES
    Publication number: 20160041487
    Abstract: There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 ?m, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 ?m. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.
    Type: Application
    Filed: February 26, 2014
    Publication date: February 11, 2016
    Inventors: Takeshi KAWAUCHI, Shou OGAWA, Yukihiro MATSUDA
  • Carrier core particle for electrophotographic developer, carrier for electrophotographic developer and electrophotographic developer
    Patent number: 8883388
    Abstract: A carrier core particle for an electrophotographic developer including a core composition expressed by a general formula: (MnxMgyCaz) FeWO4+V (x+y+z+w=3, ?0.003<v) as a main ingredient, wherein 0.05?y?0.35 and 0.005?z?0.024.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: November 11, 2014
    Assignees: Dowa Electronics Materials Co., Ltd., Dowa IP Creation Co., Ltd.
    Inventors: Takeshi Kawauchi, Yukihiro Matsuda
  • CARRIER CORE PARTICLE FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER
    Publication number: 20130189614
    Abstract: A carrier core particle for an electrophotographic developer including a core composition expressed by a general formula: (MnxMgyCaz) FeWO4+V (x+y+z+w=3, ?0.003<v) as a main ingredient, wherein 0.05?y?0.35 and 0.005?z?0.024.
    Type: Application
    Filed: July 26, 2011
    Publication date: July 25, 2013
    Applicants: DOWA IP CREATION CO., LTD., DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Takeshi Kawauchi, Yukihiro Matsuda