Patents by Inventor Yasuo Kadokura

Yasuo Kadokura 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).

  • ELECTROSTATIC IMAGE DEVELOPING TONER, ELECTROSTATIC IMAGE DEVELOPER AND TONER CARTRIDGE
    Publication number: 20170227861
    Abstract: An electrostatic image developing toner contains: toner particles, first silica particles having an average equivalent circle diameter of 10 nm to 120 nm and second silica particles having a compressive agglomeration degree of 60% to 95%, a particle compression ratio of 0.20 to 0.40 and an average equivalent circle diameter being greater than the average equivalent circle diameter of the first silica particles.
    Type: Application
    Filed: August 1, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yuka ZENITANI, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER AND TONER CARTRIDGE
    Publication number: 20170227859
    Abstract: An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.
    Type: Application
    Filed: August 30, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tomohito NAKAJIMA, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20170227863
    Abstract: An electrostatic charge image developing toner includes toner particles and an external additive that includes silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40 and fatty acid metal salt particles.
    Type: Application
    Filed: July 15, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Yasuhisa MOROOKA, Shunsuke NOZAKI, Takeshi IWANAGA, Sakae TAKEUCHI
  • IMAGE FORMING APPARATUS, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER
    Publication number: 20170227865
    Abstract: An image forming apparatus includes a developing unit that contains an electrostatic charge image developer and develops an electrostatic charge image formed on the surface of an image holding member as a toner image by using the developer, wherein the developer contains a carrier and an electrostatic charge image developing toner that includes a toner particle and an external additive, the toner particles have an average circularity of from 0.98 to 1.00 and a number-particle diameter distribution index (lower GSD) on a small diameter side of 1.22 or more and contain at least a vinyl resin, and the external additive contains silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Application
    Filed: July 27, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi IIDA, Hiroyoshi OKUNO, Satoshi INOUE, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA
  • RESIN PARTICLE COMPOSITION
    Publication number: 20170226326
    Abstract: A resin particle composition includes resin particles, inorganic particles surface-treated with oil, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Application
    Filed: July 12, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Sakae TAKEUCHI, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Yasuo KADOKURA, Tomohito NAKAJIMA, Takeshi IWANAGA, Shunsuke NOZAKI, Yuka ZENITANI, Yoshifumi ERI, Yasuhisa MOROOKA
  • IMAGE FORMING APPARATUS, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER
    Publication number: 20170227871
    Abstract: An image forming apparatus includes a developing unit that contains an electrostatic charge image developer and develops an electrostatic charge image formed on a surface of the image holding member with the developer, wherein the developer contains a carrier and an electrostatic charge image developing toner that includes a toner particle which contains a urea-modified polyester resin, and includes, in a vicinity of a surface thereof, vinyl resin particles; and an external additive which contains silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Application
    Filed: July 27, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tomohito NAKAJIMA, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Yasuo KADOKURA, Yasuhisa MOROOKA, Shunsuke NOZAKI
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20170227860
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40 and polishing agent particles.
    Type: Application
    Filed: July 19, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi ERI, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA
  • Electrostatic charge image developer, developer cartridge, and process cartridge
    Patent number: 9726998
    Abstract: An electrostatic charge image developer includes an electrostatic charge image developing toner that includes toner particles, and an external additive which is added to the toner particles and which includes silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40, and a carrier for developing an electrostatic charge image that has a core including a magnetic member in a binder resin for a core and a coating layer which coders a surface or the core and which includes a resin for a coating layer and has a surface roughness Ra of from 0.25 ?m to 0.4 ?m.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: August 8, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhisa Morooka, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 9726994
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40 and polishing agent particles.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: August 8, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi Eri, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • SILICA PARTICLE AND METHOD OF PREPARING SILICA PARTICLE
    Publication number: 20170073236
    Abstract: A silica particle has a compression and aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Application
    Filed: January 20, 2016
    Publication date: March 16, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Yasuo KADOKURA, Yasuhisa MOROOKA, Shunsuke NOZAKI, Takeshi IWANAGA, Sakae TAKEUCHI
  • Resin particle and method for producing the same
    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
  • Method of manufacturing silica particle dispersion
    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
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 9176408
    Abstract: An electrostatic charge image developing toner includes a toner particle including a core particle containing a polyester resin and a coating layer containing a vinyl resin that coats the surface of the core particle, and an external additive that is formed of silica particles having an average circularity of from 0.75 to 0.9 and an average value of ratios of circle equivalent diameters Da obtained by a plane image analysis to the maximum height H obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: November 3, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Emi Matsushita, Hiroyoshi Okuno
  • Resin particle and method for producing the same
    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
  • Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, developing device, image forming apparatus, and image forming method
    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
  • Toner, developer, toner cartridge, and image forming apparatus
    Patent number: 8859176
    Abstract: A toner contains a binder resin and a polyalkylene, wherein the following formula is satisfied: 2?A/B?100 where A represents a reflectance at a light-receiving angle of +30° and B represents a reflectance at a light-receiving angle of ?30°, A and B being measured when a solid fixed image formed by the toner is irradiated with incident light at an incident angle of ?45° using a goniophotometer.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: October 14, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Kadokura, Masaru Takahashi, Shotaro Takahashi, Shuji Sato
  • Transparent toner for developing electrostatic latent image, electrostatic latent image developer, toner cartridge, process cartridge, image forming apparatus and image forming method
    Patent number: 8859175
    Abstract: The invention provides a transparent toner for developing an electrostatic latent image, including a binder resin and a release agent, the difference between the endothermic peak Tm of the release agent in a temperature increasing process and the exothermic peak Tc of the release agent in a temperature decreasing process being from about 10° C. to about 50° C., where Tm and Tc are measured with a differential scanning calorimeter (DSC) according to the ASTM method.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: October 14, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Atsushi Sugawara, Masaru Takahashi, Yasuo Kadokura, Masanobu Ninomiya
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20140295339
    Abstract: An electrostatic charge image developing toner includes a toner particle including a core particle containing a polyester resin and a coating layer containing a vinyl resin that coats the surface of the core particle, and an external additive that is formed of silica particles having an average circularity of from 0.75 to 0.9 and an average value of ratios of circle equivalent diameters Da obtained by a plane image analysis to the maximum height H obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.
    Type: Application
    Filed: September 13, 2013
    Publication date: October 2, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Emi MATSUSHITA, Hiroyoshi OKUNO
  • RESIN PARTICLE AND METHOD FOR PRODUCING THE SAME
    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
  • Transparent toner for electrostatic latent image development, method for producing the same, electrostatic latent image developer, toner cartridge, process cartridge, and image forming apparatus
    Patent number: 8785098
    Abstract: The invention provides a transparent toner for electrostatic latent image development, containing a polyester resin and a release agent, the difference between an endothermic peak Tm of the release agent in a temperature increasing process and an exothermic peak Tc of the release agent in a temperature decreasing process when measured by an ASTM method with a differential scanning calorimeter (DSC) is from about 40° C. to about 50° C., and the degree of exposure of the release agent at the surface of the toner as determined quantitatively by X-ray photoelectron spectroscopy (XPS) is about 10% or less.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: July 22, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masaru Takahashi, Atsushi Sugawara, Yasuo Kadokura, Masanobu Ninomiya