Patents by Inventor Masami TUJIHIRO

Masami TUJIHIRO 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 and two-component developer
    Patent number: 9029060
    Abstract: A carrier for electrostatic latent image developing is composed of carrier core containing a binder resin and magnetic material particles, and a shell layer that covers the carrier core. The binder has an acid value of at least a predetermined value, and contains a resin having a carboxyl group. The shell layer is composed of a resin selected from melamine resin and urea resin.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: May 12, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tujihiro, Yoshio Ozawa
  • Positively chargeable toner for electrostatic image development
    Patent number: 8871414
    Abstract: Domains of a charge control resin are formed by dispersing a charge control resin containing a quaternary ammonium salt functional group-containing resin of a copolymer of an addition-polymerizable monomer having a quaternary ammonium salt functional group and a styrene and/or acrylic monomer into a polyester resin as binder resin, and the proportion of the number of domains of the charge control resin with a domain diameter of no less than 0.01 ?m to less than 0.3 ?m versus the number of domains of the charge control resin with a domain diameter of no less than 0.01 ?m, which is measured by a predetermined method, is adjusted to no less than 98% by number.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: October 28, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Masami Tujihiro, Toshiki Takemori
  • CARRIER AND TWO-COMPONENT DEVELOPER
    Publication number: 20140087301
    Abstract: A carrier for electrostatic latent image developing is composed of carrier core containing a binder resin and magnetic material particles, and a shell layer that covers the carrier core. The binder has an acid value of at least a predetermined value, and contains a resin having a carboxyl group. The shell layer is composed of a resin selected from melamine resin and urea resin.
    Type: Application
    Filed: September 25, 2013
    Publication date: March 27, 2014
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Masami Tujihiro, Yoshio Ozawa
  • Developer for electrostatic latent image development and image forming method
    Patent number: 8632933
    Abstract: A developer for electrostatic latent image development including a positively chargeable toner and a fatty acid metal salt is used, in which the fatty acid metal salt is a metal salt selected from the group consisting of zinc, calcium, and magnesium salts of fatty acids of 12 to 20 carbon atoms and has a certain volume average particle diameter and particle size distribution.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: January 21, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Masami Tujihiro, Yukinori Nakayama
  • DEVELOPER FOR ELECTROSTATIC LATENT IMAGE DEVELOPMENT AND IMAGE FORMING METHOD
    Publication number: 20130029259
    Abstract: A developer for electrostatic latent image development including a positively chargeable toner and a fatty acid metal salt is used, in which the fatty acid metal salt is a metal salt selected from the group consisting of zinc, calcium, and magnesium salts of fatty acids of 12 to 20 carbon atoms and has a certain volume average particle diameter and particle size distribution.
    Type: Application
    Filed: July 20, 2012
    Publication date: January 31, 2013
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Masami Tujihiro, Yukinori Nakayama
  • POSITIVELY CHARGEABLE TONER FOR ELECTROSTATIC IMAGE DEVELOPMENT
    Publication number: 20120189953
    Abstract: Domains of a charge control resin are formed by dispersing a charge control resin containing a quaternary ammonium salt functional group-containing resin of a copolymer of an addition-polymerizable monomer having a quaternary ammonium salt functional group and a styrene and/or acrylic monomer into a polyester resin as binder resin, and the proportion of the number of domains of the charge control resin with a domain diameter of no less than 0.01 ?m to less than 0.3 ?m versus the number of domains of the charge control resin with a domain diameter of no less than 0.01 ?m, which is measured by a predetermined method, is adjusted to no less than 98% by number.
    Type: Application
    Filed: January 24, 2012
    Publication date: July 26, 2012
    Applicant: KYOCERA MITA CORPORATION
    Inventors: Masami TUJIHIRO, Toshiki TAKEMORI