Patents by Inventor Seiji Kikushima

Seiji Kikushima 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).

  • Patent number: 10481530
    Abstract: A separation member that is used to separate a conveyance object from two rotation members, the conveyance object having been sent out from a nip that is formed by the two rotation members that are in contact with one another, the separation member includes a wavy part directed toward the nip and inclined from a normal to a center line of the two rotation members at a predetermined angle. The wavy part covers a contact zone where the conveyance object can come into contact with the separation member along a conveyance direction and along a width direction of the conveyance object, and the wavy part has a plurality of depressions parallel to each other and extending in a direction inclined from the conveyance direction and inclined from the width direction, at least two of the depressions overlapping along the conveyance direction.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: November 19, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Seiji Saitoh, Keisuke Kubota, Masami Okamoto, Kenji Nozawa, Fumihiro Hirose, Kensuke Yamaji, Shuutaroh Yuasa, Yuuki Kikushima, Kaori Hemmi, Yuuta Kanda
  • Patent number: 9709909
    Abstract: An electrostatic latent image developing toner includes toner particles containing a binder resin and at least one type of wax. A dispersed-phase diameter distribution of the wax has a peak at a dispersed-phase diameter in a range from 0.04 ?m to 0.20 ?m and a peak at a dispersed-phase diameter in a range from 1.0 ?m to 5.0 ?m. The wax includes first wax particles each having a dispersed-phase diameter in the range from 0.04 ?m to 0.20 ?m and second wax particles each having a dispersed-phase diameter in the range from 1.0 ?m to 5.0 ?m. A volume ratio of the first wax particles relative to the second wax particles is at least 0.5 and no greater than 1.5.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: July 18, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Publication number: 20160170318
    Abstract: An electrostatic latent image developing toner includes toner particles containing a binder resin and at least one type of wax. A dispersed-phase diameter distribution of the wax has a peak at a dispersed-phase diameter in a range from 0.04 ?m to 0.20 ?m and a peak at a dispersed-phase diameter in a range from 1,0 ?m to 5.0 ?m. The wax includes first wax particles each having a dispersed-phase diameter in the range from 0.04 ?m to 0.20 ?m and second wax particles each having a dispersed-phase diameter in the range from 1.0 ?m to 5.0 ?m. A volume ratio of the first wax particles relative to the second wax particles is at least 0.5 and no greater than 1.5.
    Type: Application
    Filed: December 11, 2015
    Publication date: June 16, 2016
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Seiji KIKUSHIMA
  • Patent number: 9217940
    Abstract: A method for producing a toner includes: dissolving a thermoplastic resin and a thermosetting resin in an organic solvent; mixing the organic solvent containing the thermoplastic resin and the thermosetting resin with an aqueous medium, and micronizing the thermoplastic resin in a mixture obtained; and forming a film of the dissolved thermosetting resin on surfaces of fine particles formed through the micronization.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: December 22, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Patent number: 9201322
    Abstract: A positively chargeable toner for electrostatic image development according to the present disclosure is formed by aggregating at least binder resin-containing fine particles and colorant-containing fine particles in an aqueous medium in the presence of a dispersing agent and a metal ion to form fine particle aggregates and heating the fine particle aggregates to coalesce components in the fine particle aggregates. The binder resin used is a (meth)acrylic resin or styrene-(meth)acrylic resin having a certain quaternary ammonium group. The hydrophobicity (methanol wettability) is adjusted to a certain range.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: December 1, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Patent number: 9023573
    Abstract: A toner for electrostatic-charge image development contains toner particles in which the surfaces of core particles, including a binder resin composed of a polyester resin, are coated with shell layers. The shell layer is formed of a resin composed of a copolymer of monomers including a monomer having a quaternary ammonium group and a (meth)acrylic copolymer. The molar ratio of units derived from a monomer having a quaternary ammonium group is 5 mol % or more and 35 mol % or less.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: May 5, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Publication number: 20150079517
    Abstract: A method for producing a toner includes: dissolving a thermoplastic resin and a thermosetting resin in an organic solvent; mixing the organic solvent containing the thermoplastic resin and the thermosetting resin with an aqueous medium, and micronizing the thermoplastic resin in a mixture obtained; and forming a film of the dissolved thermosetting resin on surfaces of fine particles formed through the micronization.
    Type: Application
    Filed: September 11, 2014
    Publication date: March 19, 2015
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Seiji KIKUSHIMA
  • Patent number: 8980516
    Abstract: An electrostatic charge image development toner contains a plurality of toner particles. The plurality of toner particles are each formed to have resin particulates in a surface layer. The resin particulates each include a particulate core and a coating layer covering the particulate core. The particulate core contains a quaternary ammonium salt functional group-containing resin. The coating layer contains one or more resins selected from the group consisting of (meth)acrylic resins and styrene-(meth)acrylic resins.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: March 17, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Publication number: 20140322644
    Abstract: A positively chargeable toner for electrostatic image development according to the present disclosure is formed by aggregating at least binder resin-containing fine particles and colorant-containing fine particles in an aqueous medium in the presence of a dispersing agent and a metal ion to form fine particle aggregates and heating the fine particle aggregates to coalesce components in the fine particle aggregates. The binder resin used is a (meth)acrylic resin or styrene-(meth)acrylic resin having a certain quaternary ammonium group. The hydrophobicity (methanol wettability) is adjusted to a certain range.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 30, 2014
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Publication number: 20140186759
    Abstract: An electrostatic charge image development toner contains a plurality of toner particles. The plurality of toner particles are each formed to have resin particulates in a surface layer. The resin particulates each include a particulate core and a coating layer covering the particulate core. The particulate core contains a quaternary ammonium salt functional group-containing resin. The coating layer contains one or more resins selected from the group consisting of (meth)acrylic resins and styrene-(meth)acrylic resins.
    Type: Application
    Filed: December 26, 2013
    Publication date: July 3, 2014
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Seiji KIKUSHIMA
  • Patent number: 8679721
    Abstract: The present disclosure aims to provide a toner that is capable of keeping a photoreceptor drum in satisfactory condition for a long period of time and preventing the occurrence of pinholes on the photoreceptor drum, which plays a key role in forming images. The present disclosure provides an electrostatic charge image developing toner in which an external additive is added to toner base particles, wherein the external additive includes inorganic fine particles attached with conductive fine particles, and the conductive fine particles are attached to the inorganic fine particles with certain strength.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: March 25, 2014
    Assignee: Kyocera Mita Corporation
    Inventor: Seiji Kikushima
  • Publication number: 20140065536
    Abstract: A toner for electrostatic-charge image development contains toner particles in which the surfaces of core particles, including a binder resin composed of a polyester resin, are coated with shell layers. The shell layer is formed of a resin composed of a copolymer of monomers including a monomer having a quaternary ammonium group and a (meth)acrylic copolymer. The molar ratio of units derived from a monomer having a quaternary ammonium group is 5 mol % or more and 35 mol % or less.
    Type: Application
    Filed: August 29, 2013
    Publication date: March 6, 2014
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Patent number: 8497055
    Abstract: To provide an electrostatic charge developing toner in which resin fine particles and inorganic fine particles are externally added to toner base particles, wherein the toner base particles include at least binder resin and colorant, the resin fine particles are monodispersed and fixed to surfaces of the toner base particles, and following equations are established: a=70 to 160 nm, b/a=0.2 to 0.5, and c/a=0.6 to 0.8, where “a” represents an average of diameters (nm) of circular surfaces of contact between the fixed resin fine particles and toner base particle surfaces, “b” represents an average of heights (nm) of the resin fine particles from the contact surfaces, and “c” represents an average diameter (nm) of the resin fine particle at the height b/2.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: July 30, 2013
    Assignee: Kyocera Mita Corporation
    Inventor: Seiji Kikushima
  • Publication number: 20120058424
    Abstract: To provide an electrostatic charge developing toner in which resin fine particles and inorganic fine particles are externally added to toner base particles, wherein the toner base particles include at least binder resin and colorant, the resin fine particles are monodispersed and fixed to surfaces of the toner base particles, and following equations are established: a=70 to 160 nm, b/a=0.2 to 0.5, and c/a=0.6 to 0.8, where “a” represents an average of diameters (nm) of circular surfaces of contact between the fixed resin fine particles and toner base particle surfaces, “b” represents an average of heights (nm) of the resin fine particles from the contact surfaces, and “c” represents an average diameter (nm) of the resin fine particle at the height b/2.
    Type: Application
    Filed: September 1, 2011
    Publication date: March 8, 2012
    Applicant: KYOCERA MITA CORPORATION
    Inventor: Seiji Kikushima
  • Publication number: 20110294057
    Abstract: The present disclosure aims to provide a toner that is capable of keeping a photoreceptor drum in satisfactory condition for a long period of time and preventing the occurrence of pinholes on the photoreceptor drum, which plays a key role in forming images. The present disclosure provides an electrostatic charge image developing toner in which an external additive is added to toner base particles, wherein the external additive includes inorganic fine particles attached with conductive fine particles, and the conductive fine particles are attached to the inorganic fine particles with certain strength.
    Type: Application
    Filed: May 23, 2011
    Publication date: December 1, 2011
    Applicant: KYOCERA MITA CORPORATION
    Inventor: Seiji Kikushima
  • Patent number: 7618760
    Abstract: A two-component developer suppresses burying of an external additive into toner particles and a change in charging performance of a toner with time, and secures stable development performance. The two-component developer includes a toner and a carrier and is adjusted so that a rate of change ?A % in BET specific surface area A (m2/g) of the toner (=((A120?A1)/A1)×100) and a rate of change ?C % in charge quantity C (?C/g) of the carrier (=((C120?C1)/C1)×100) when a mixture of the toner and the carrier is stirred and mixed are both within 10 %. A1and A120 indicate BET specific surface areas of the toner when the mixture of the toner and the carrier is stirred and mixed for 1 minute and 120 minutes, and C1 and C120 indicate charge quantities of the carrier when the mixture is stirred and mixed for 1 minute and 120 minutes.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: November 17, 2009
    Assignee: Kyocera Mita Corporation
    Inventor: Seiji Kikushima
  • Publication number: 20090190959
    Abstract: A developer including a toner containing the cylindrical toner particles obtained by melting toner raw materials including binder resins, pigments, and waxes, forming a fibrous intermediate from the melted toner raw materials and cutting the fibrous intermediate, wherein the cylindrical toner particles have a ratio (L/D) of the cylindrical length (L) to the cylindrical cross-sectional diameter (D) of 0.1 to 0.9.
    Type: Application
    Filed: January 22, 2009
    Publication date: July 30, 2009
    Applicant: KYOCERA MITA CORPORATION
    Inventor: Seiji Kikushima
  • Publication number: 20090029281
    Abstract: To provide a two-component developer and an image forming device which are excellent in stability of image density in formed images even when image formation is continued for a long time, by controlling non-electrostatic adhesion force between toner particle and a carrier or developing roll and maintaining the charge property of toner particle effectively. A two-component developer in which the surface of a toner particle and the surface of a carrier are each covered with a fluorine compound, wherein a ratio represented by (A2/A1) is adjusted to a value within a range of from 0.1 to 0.5 where the coverage with the fluorine compound on the surface of the toner particle is A1 and the coverage with the fluorine compound on the surface of the carrier is (A2).
    Type: Application
    Filed: June 30, 2008
    Publication date: January 29, 2009
    Applicant: KYOCERA MITA CORPORATION
    Inventor: Seiji Kikushima
  • Publication number: 20080081276
    Abstract: To provide a two-component developer which can maintain the triboelectrification property effectively and can inhibit the generation of fogging effectively even when image formation is performed continuously for a long time by inhibiting inorganic fine particles from burying into a covering resin layer of a carrier to control the degradation of the carrier, and to provide an image forming method and an image forming apparatus using the same. A two-component developer comprising toner particles, a carrier, inorganic fine particles and resin fine particles; and an image forming method and an image forming apparatus using the same are provided.
    Type: Application
    Filed: September 19, 2007
    Publication date: April 3, 2008
    Inventor: Seiji Kikushima
  • Publication number: 20070202426
    Abstract: An object of the present invention is to provide a two-component developer that suppresses burying of an external additive into toner particles and a change in charging performance of a toner with time, and secures stable development performance. To achieve this object, the two-component developer of the present invention including a toner containing resin microparticles and silica microparticles and a carrier containing resin coat layers is adjusted so that a rate of change ?A % in BET specific surface area A (m2/g) of the toner (=((A120?A1)/A1)×100) and a rate of change ?C % in charge quantity C (?C/g) of the carrier (=((C120?C1)/C1)×100) when a mixture of the toner and the carrier is stirred and mixed by a TURBULA shaker mixer are both within 10%.
    Type: Application
    Filed: February 21, 2007
    Publication date: August 30, 2007
    Applicant: KYOCERA MITA CORPORATION
    Inventor: Seiji Kikushima