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 CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20180059564
    Abstract: An electrostatic charge image developing toner includes toner particles including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement by differential scanning calorimetry before and after being heated at a temperature of 50° C. and a humidity of 50% RH for a week, a relationship between an endothermic amount x (J/g) derived from the crystalline resin with respect to the toner particles before being heated and an endothermic amount y (J/g) derived from the crystalline resin with respect to the toner particles after being heated satisfies Expression (1): x/y<0.3.
    Type: Application
    Filed: April 26, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satoshi MIURA, Yasuo KADOKURA, Akira MATSUMOTO, Shinya NAKASHIMA, Yukiaki NAKAMURA
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20180059561
    Abstract: An electrostatic charge image developing toner includes toner particles including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement by differential scanning calorimetry (DSC) before and after being stored at a temperature of 50° C. and a humidity of 90% RH for 24 hours, a relationship between an onset temperature T1 (° C.) of an endothermic peak having the lowest peak temperature in a first heating step with respect to the toner particles before being stored and an onset temperature T2 (° C.) of an endothermic peak having the lowest peak temperature in a first heating step with respect to the toner particles after being stored satisfies Expression (1): 2<T2?T1<10.
    Type: Application
    Filed: April 17, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shinya NAKASHIMA, Akira MATSUMOTO, Yasuo KADOKURA, Yukiaki NAKAMURA, Satoshi MIURA
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20180059560
    Abstract: An electrostatic charge image developing toner includes toner particles including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement by differential scanning calorimetry before and after being heated at a temperature of 50° C. and a humidity of 50% RH for a week, a relationship between an endothermic amount S1 (J/g) derived from the crystalline resin in a first heating process with respect to the toner particles before being heated and an endothermic amount Sh (J/g) derived from the crystalline resin in a first heating process with respect to the toner particles after being heated satisfies Expression (1): 0.50?S1/Sh?0.90.
    Type: Application
    Filed: May 1, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Akira MATSUMOTO, Yasuo KADOKURA, Shinya NAKASHIMA, Yukiaki NAKAMURA, Satoshi MIURA
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20180059563
    Abstract: An electrostatic charge image developing toner includes toner particles each including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin on a cross section of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for three days, a relationship between an area ratio a (%) of the crystalline resin on a cross section with respect to the toner particles before being heated, and an area ratio b (%) of the crystalline resin on the cross section with respect to the toner particles after being heated satisfies Expression (1): 0.9?a/b?1.0.
    Type: Application
    Filed: April 20, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yukiaki NAKAMURA, Akira MATSUMOTO, Yasuo KADOKURA, Shinya NAKASHIMA, Satoshi MIURA, Sakiko HIRAI, Shotaro TAKAHASHI, Daisuke TOMITA, Satoshi KAMIWAKI, Masaru TAKAHASHI
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20180059562
    Abstract: An electrostatic charge image developing toner includes toner particles including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin present on a surface of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for a week, a relationship between an area ratio a (%) of the crystalline resin present on a surface of the toner particles before being heated and an area ratio b (%) of the crystalline resin present on a surface of the toner particles after being heated satisfies Expression (1): 0.05?(b?a)/b?0.50.
    Type: Application
    Filed: April 19, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Akira MATSUMOTO, Shinya NAKASHIMA, Yukiaki NAKAMURA, Satoshi MIURA
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 9904197
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: February 27, 2018
    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
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 9891543
    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: Grant
    Filed: July 15, 2016
    Date of Patent: February 13, 2018
    Assignee: 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
  • Electrostatic charge image developing toner, electrostatic charge image developer and toner cartridge
    Patent number: 9885966
    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: Grant
    Filed: August 30, 2016
    Date of Patent: February 6, 2018
    Assignee: 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
    Patent number: 9864287
    Abstract: An electrostatic charge image developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: January 9, 2018
    Assignee: 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
  • Electrostatic charge image developer, developer cartridge, and process cartridge
    Patent number: 9835966
    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 includes a core particle and a resin coated layer which covers a surface of the core particle and that has a surface roughness Ra (based on JIS-B0601) of 0.5 ?m or less and a circularity of 0.975 or more.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: December 5, 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
  • Magnetic one-component developer, developer cartridge, process cartridge, image forming apparatus, and image forming method
    Patent number: 9835963
    Abstract: A magnetic one-component developer includes magnetic toner particles containing a binder resin and a magnetic powder, and silica particles having a compression and aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: December 5, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satoshi Inoue, Hiroyoshi Okuno, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Yasuhisa Morooka, Yasuo Kadokura, Shunsuke Nozaki
  • Image forming apparatus, electrostatic charge image developer, and electrostatic charge image developing toner
    Patent number: 9785069
    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: Grant
    Filed: July 27, 2016
    Date of Patent: October 10, 2017
    Assignee: 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: 20170226316
    Abstract: The invention is directed to a resin particle composition, containing: resin particles; lubricant particles; and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40, and a resin particle composition, containing: resin particles, on the surface of which at least a part of a release agent is exposed; 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 29, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Yasuo KADOKURA, Yasuhisa MOROOKA, Shunsuke NOZAKI, Sakae TAKEUCHI
  • RESIN PARTICLE COMPOSITION
    Publication number: 20170226314
    Abstract: A resin particle composition includes resin particles, polishing agent particles having an average circle-equivalent diameter of 0.1 ?m to 3.0 ?m, 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 25, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Sakae TAKEUCHI, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Yasuo KADOKURA, Takeshi IWANAGA, Shunsuke NOZAKI, Yasuhisa MOROOKA
  • MAGNETIC ONE-COMPONENT DEVELOPER, DEVELOPER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20170227867
    Abstract: A magnetic one-component developer includes magnetic toner particles containing a binder resin and a magnetic powder, and silica particles having a compression and aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
    Type: Application
    Filed: July 8, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satoshi INOUE, Hiroyoshi OKUNO, Yoshifumi IIDA, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Yasuhisa MOROOKA, Yasuo KADOKURA, Shunsuke NOZAKI
  • ELECTROSTATIC CHARGE IMAGE DEVELOPER, DEVELOPER CARTRIDGE, AND PROCESS CARTRIDGE
    Publication number: 20170227876
    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 includes a core particle and a resin coated layer which covers a surface of the core particle and that has a surface roughness Ra (based on JIS-B0601) of 0.5 ?m or less and a circularity of 0.975 or more.
    Type: Application
    Filed: July 25, 2016
    Publication date: August 10, 2017
    Applicant: 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
    Publication number: 20170227870
    Abstract: An electrostatic charge lavage developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Application
    Filed: July 26, 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
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, AND TONER CARTRIDGE
    Publication number: 20170227874
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.
    Type: Application
    Filed: July 21, 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
    Publication number: 20170227875
    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 covers a surface of 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: Application
    Filed: July 12, 2016
    Publication date: August 10, 2017
    Applicant: 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
  • TONER FOR ELECTROSTATIC IMAGE DEVELOPMENT, ELECTROSTATIC IMAGE DEVELOPER, TONER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20170227869
    Abstract: A toner for electrostatic image development includes toner particles; and an external additive containing silica particles and polytetrafluorethylene particles, the silica particles having a compression-aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
    Type: Application
    Filed: July 25, 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