Patents by Inventor Hideaki Yoshikawa

Hideaki Yoshikawa 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).

  • Publication number: 20180161763
    Abstract: A titanium oxide particle includes a metal having a hydrocarbon group, which is bonded to a surface of the titanium oxide particle through an oxygen atom, and absorbs light having a wavelength of 450 nm and light having a wavelength of 750 nm, wherein an element ratio C/Ti between carbon C and titanium Ti in a surface of the titanium oxide particle is from 0.3 to 1.2, and a reduced amount of C/Ti on the surface of the titanium oxide particle before and after irradiation with an ultraviolet ray having a wavelength of 352 nm and at an irradiation intensity of 1.3 mW/cm2 for 20 hours is from 0.1 to 0.9.
    Type: Application
    Filed: August 9, 2017
    Publication date: June 14, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Hiroyoshi OKUNO, Hideaki YOSHIKAWA, Yasunobu KASHIMA, Sakae TAKEUCHI
  • Publication number: 20180161765
    Abstract: A titanium oxide particle includes bonded thereon a metal-containing compound which has a hydrocarbon group, wherein the titanium oxide particle has an absorption at 450 nm and 750 nm in a visible absorption spectrum, and with respect to a surface of the particle, an element ratio M/Ti between metal M of the metal-containing compound and titanium is from 0.1 to 0.4 and an element ratio C/Ti between carbon C and titanium is from 0.3 to 1.2.
    Type: Application
    Filed: April 19, 2017
    Publication date: June 14, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasunobu KASHIMA, Hiroyoshi OKUNO, Hideaki YOSHIKAWA, Takeshi IWANAGA, Sakae TAKEUCHI
  • Publication number: 20180162887
    Abstract: A metatitanic acid particle including bonded thereon a metal-containing compound which has a hydrocarbon group, wherein the metatitanic acid particle has an absorption at 450 nm and 750 nm in a visible absorption spectrum, and with respect to a surface of the particle, an element ratio M/Ti between metal M of the metal-containing compound and titanium is from 0.1 to 0.4 and an element ratio C/Ti between carbon C and titanium is from 0.3 to 1.2.
    Type: Application
    Filed: April 11, 2017
    Publication date: June 14, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hiroyoshi OKUNO, Hideaki YOSHIKAWA, Yasunobu KASHIMA, Takeshi IWANAGA, Sakae TAKEUCHI
  • Publication number: 20170252724
    Abstract: A silica particle includes a silica particle body and a titania coating layer formed on a surface of the silica particle body through a reaction of a titanium compound having a structure in which a hydrocarbon group bonds to a titanium atom through an oxygen atom. The silica particle has absorption at a wavelength of about 400 nm or more and about 800 nm or less in an ultraviolet-visible absorption spectrum.
    Type: Application
    Filed: July 29, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideaki YOSHIKAWA, Hidekazu HIROSE, Hiroyoshi OKUNO, Takeshi IWANAGA, Yasunobu KASHIMA, Wataru YAMADA, Sakae TAKEUCHI, Atsushi SUGITATE
  • Publication number: 20170253621
    Abstract: A metatitanic acid particle surface-treated with a silane compound having a hydrocarbon group has absorption at a wavelength of about 400 nm or more and about 800 nm or less in an ultraviolet-visible absorption spectrum, and has an absorption peak at a wave number of about 2700 cm?1 or more and about 3000 cm?1 or less in an infrared absorption spectrum.
    Type: Application
    Filed: July 15, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideaki YOSHIKAWA, Hidekazu HIROSE, Hiroyoshi OKUNO, Takeshi IWANAGA, Yasunobu KASHIMA, Wataru YAMADA, Sakae TAKEUCHI, Atsushi SUGITATE
  • Publication number: 20170252736
    Abstract: A titanium oxide particle surface-treated with a silane compound having a hydrocarbon group has absorption at a wavelength of about 400 nm or more and about 800 nm or less in an ultraviolet-visible absorption spectrum, and has an absorption peak at a wave number of about 2700 cm?1 or more and about 3000 cm?1 or less in an infrared absorption spectrum.
    Type: Application
    Filed: July 12, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hidekazu HIROSE, Hideaki YOSHIKAWA, Hiroyoshi OKUNO, Takeshi IWANAGA, Yasunobu KASHIMA, Wataru YAMADA, Sakae TAKEUCHI, Atsushi SUGITATE
  • Patent number: 9475704
    Abstract: A method for manufacturing a fatty acid metal salt particle includes forming a coating layer including a fatty acid metal salt on a surface of a core material particle in supercritical carbon dioxide.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: October 25, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hiroyoshi Okuno, Junichi Tomonaga, Takeshi Iwanaga, Shunsuke Nozaki, Hideaki Yoshikawa
  • Patent number: 9416015
    Abstract: The invention provides a method of producing silica particles, the method including preparing an alkali catalyst solution containing an alkali catalyst in a solvent including an alcohol, at a concentration of from about 0.6 mol/L to about 0.85 mol/L; and supplying tetraalkoxysilane into the alkali catalyst solution, and concurrently supplying an alkali catalyst into the alkali catalyst solution at a rate of from about 0.1 mol to about 0.4 mol per mole of the total amount of supply of the tetraalkoxysilane supplied in one minute.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: August 16, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
  • Patent number: 9394413
    Abstract: A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=?×(Volume average particle diameter)/1000+???(1) wherein ? is from ?2.5 to ?0.9, and ? is from 0.8 to 1.2.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: July 19, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi, Yasuo Kadokura
  • Patent number: 9233853
    Abstract: A method for producing silica particles, includes preparing a silica particle dispersion containing silica particles, and a solvent containing an alcohol and water, and bringing supercritical carbon dioxide into contact with the silica particle dispersion to remove the solvent.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: January 12, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakae Takeuchi, Shinichiro Kawashima, Hiroyoshi Okuno, Hideaki Yoshikawa, Yuji Masuda, Shunsuke Nozaki, Yuka Zenitani
  • Patent number: 9199852
    Abstract: A method of manufacturing a silica particle dispersion, includes preparing a silica particle dispersion containing silica particles and a solvent, primary concentrating the silica particle dispersion, adding a hydrophobizing treatment agent to the silica particle dispersion after the primary concentrating, and secondary concentrating the silica particle dispersion after the adding.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: December 1, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakae Takeuchi, Shinichiro Kawashima, Hiroyoshi Okuno, Hideaki Yoshikawa, Yasuo Kadokura, Shunsuke Nozaki, Yuka Zenitani
  • Patent number: 9187502
    Abstract: The present invention provides silica particles including primary particles, the primary particles having an average particle diameter in a range of from about 100 nm to about 500 nm, a particle size distribution index in a range of from about 1.40 to about 1.80, and an average roundness in a range of from about 0.5 to about 0.85, and about 95% or more, by number of particles, of the primary particles satisfying following Formula (1) with respect to a roundness (R) and a particle diameter (D) (nm): R=?×D/1000+???Formula (1) (?2.5????0.9, 0.8???1.2).
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: November 17, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
  • Patent number: 8962139
    Abstract: A resin particle including: a resin mother particle; and silica particles externally added onto a surface of the resin mother particle, wherein primary particles of the silica particles, the primary particles which have a volume average particle diameter of from 80 nm to 300 nm, a particle size distribution index of from 1.10 to 1.40, an average circularity of from 0.70 to 0.92 and an average circularity distribution index of from 1.05 to 1.50, and a proportion of the primary particles having an average circularity of 0.95 or more is not more 10% by number.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: February 24, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuka Zenitani, Hideaki Yoshikawa, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi, Yasuo Kadokura
  • Patent number: 8956796
    Abstract: Provided is an electrostatic charge image developing toner including toner base particles which contain a polyester resin and a vinyl resin and does not have a coating layer and wherein the concentration of the polyester resin on the particle surface is higher than the concentration of the polyester resin in the inside of the particles, and a sol-gel silica which has an average circularity of from 0.75 to 0.9, on the surface of the toner base particles.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: February 17, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Kadokura, Kazufumi Tomita, Hideaki Yoshikawa
  • Patent number: 8871344
    Abstract: The invention provides silica particles including primary particles, the primary particles having a volume average particle diameter of from about 80 nm to about 300 nm, a particle size distribution index of from about 1.10 to about 1.40, an average circularity of from about 0.70 to about 0.92, and a circularity distribution index of from about 1.05 to about 1.50, the silica particles including primary particles having a circularity of about 0.95 or greater at a proportion of about 10% or less by number of particles.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: October 28, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuka Zenitani, Hideaki Yoshikawa, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
  • Publication number: 20140234626
    Abstract: A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=?×(Volume average particle diameter)/1000+???(1) wherein ? is from ?2.5 to ?0.9, and ? is from 0.8 to 1.2.
    Type: Application
    Filed: April 29, 2014
    Publication date: August 21, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI, Yasuo KADOKURA
  • Publication number: 20140178813
    Abstract: A method for manufacturing a fatty acid metal salt particle includes forming a coating layer including a fatty acid metal salt on a surface of a core material particle in supercritical carbon dioxide.
    Type: Application
    Filed: June 6, 2013
    Publication date: June 26, 2014
    Inventors: Hiroyoshi OKUNO, Junichi TOMONAGA, Takeshi IWANAGA, Shunsuke NOZAKI, Hideaki YOSHIKAWA
  • Publication number: 20140170550
    Abstract: Provided is an electrostatic charge image developing toner including toner base particles which contain a polyester resin and a vinyl resin and does not have a coating layer and wherein the concentration of the polyester resin on the particle surface is higher than the concentration of the polyester resin in the inside of the particles, and a sol-gel silica which has an average circularity of from 0.75 to 0.9, on the surface of the toner base particles.
    Type: Application
    Filed: May 8, 2013
    Publication date: June 19, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Kazufumi TOMITA, Hideaki YOSHIKAWA
  • Patent number: 8722293
    Abstract: An electrostatic charge image developing toner includes toner particles, and an external additive. The toner particles are (1) prepared by forming aggregated particles by aggregating resin particles in a raw material dispersion in which the resin particles are dispersed, and causing the aggregated particles to coalesce by heating an aggregated particle dispersion in which the aggregated particles are dispersed so as to form the toner particles, or (2) obtained by kneading and pulverizing a material including a binder resin and a release agent, and the external additive is silica particles having an average diameter in the range of 100 nm to 500 nm, an average circularity in the range of 0.5 to 0.85, and an average of a ratio of a circle-equivalent diameter Da obtained by plane image analysis to a maximum height H obtained by 3-D image analysis of greater than 1.5 and less than 1.9.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: May 13, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yoshifumi Iida, Hideaki Yoshikawa
  • Patent number: 8628900
    Abstract: An electrostatic charge image developing toner includes: toner particles; and an external additive. The external additive contains sol-gel silica having a volume average particle diameter of from about 70 nm to about 400 nm and an average circularity of from about 0.5 to about 0.9, and a dielectric loss factor of the toner is from about 5×10?3 to about 30×10?3 when the toner is kept for 24 hours under the environment of a temperature of 28° C. and a humidity of 85%.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: January 14, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Kadokura, Shunsuke Nozaki, Hideaki Yoshikawa, Shinichiro Kawashima, Sakae Takeuchi, Yuka Zenitani, Sakon Takahashi, Hiroyoshi Okuno