Patents by Inventor Takeshi Iwanaga

Takeshi Iwanaga 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
    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
  • Carrier for two-component developer, two-component developer, and method of preparing carrier for two-component developer
    Patent number: 9885969
    Abstract: A carrier for two-component developer includes a magnetic particle and a resin coating layer that covers the magnetic particle and contains a resin, wherein a weight average molecular weight of the resin contained in the resin coating layer is from 1,800,000 to 5,000,000.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: February 6, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Tanabe, Toshiaki Hasegawa, Masaaki Usami, Yasunobu Kashima, Takeshi Iwanaga
  • Electrophotographic photoreceptor, process cartridge, and image forming apparatus
    Patent number: 9864286
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, an organic photosensitive layer on the electroconductive substrate and an inorganic protective layer on the organic photosensitive layer, wherein a layer that forms a surface of the organic photosensitive layer contains a charge transporting material, a binder resin, and a silica particle; the inorganic protective layer contains a group 13 element, an oxygen atom, and a hydrogen atom; a sum of element constitution ratios of the group 13 element, the oxygen atom, and the hydrogen atom to all elements constituting the inorganic protective layer is equal to or more than 90 atomic %; and an element composition ratio (oxygen atom/group 13 element) of the oxygen atom and the group 13 element is 1.0 or more and less than 1.5.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fumiaki Mera, Nobuyuki Torigoe, Masaki Hirakata, Hideya Katsuhara, Yoichi Kigoshi, Satomi Kashiwagi, Yuko Iwadate, Kenji Kajiwara, Tatsuki Sano, Takashi Imai, Takeshi Iwanaga
  • 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 developing carrier, method of preparing electrostatic charge image developing carrier, and electrostatic charge image developer
    Patent number: 9864293
    Abstract: An electrostatic charge image developing carrier includes magnetic particles and a resin coating layer which covers the magnetic particles, wherein a sulfate ion concentration of the resin coating layer is 0.05% by weight or less with respect to a total weight of the resin coating layer, and when a total value of a molar amount of sulfate ions contained and a molar amount of sulfo groups contained per 1 g of the resin coating layer is A mol and a molar amount of sodium ions contained per 1 g of the resin coating layer is B mol, a relationship of 0.1<B/A<1.2 is satisfied.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Toshiaki Hasegawa, Takashi Tanabe, Masaaki Usami, Yasunobu Kashima, Takeshi Iwanaga
  • 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
  • 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
  • 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
  • CARRIER FOR TWO-COMPONENT DEVELOPER, TWO-COMPONENT DEVELOPER, AND METHOD OF PREPARING CARRIER FOR TWO-COMPONENT DEVELOPER
    Publication number: 20170277054
    Abstract: A carrier for two-component developer includes a magnetic particle and a resin coating layer that covers the magnetic particle and contains a resin, wherein a weight average molecular weight of the resin contained in the resin coating layer is from 1,800,000 to 5,000,000.
    Type: Application
    Filed: August 3, 2016
    Publication date: September 28, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi TANABE, Toshiaki HASEGAWA, Masaaki USAMI, Yasunobu KASHIMA, Takeshi IWANAGA
  • ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20170269486
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, an organic photosensitive layer on the electroconductive substrate and an inorganic protective layer on the organic photosensitive layer, wherein a layer that forms a surface of the organic photosensitive layer contains a charge transporting material, a binder resin, and a silica particle; the inorganic protective layer contains a group 13 element, an oxygen atom, and a hydrogen atom; a sum of element constitution ratios of the group 13 element, the oxygen atom, and the hydrogen atom to all elements constituting the inorganic protective layer is equal to or more than 90 atomic %; and an element composition ratio (oxygen atom/group 13 element) of the oxygen atom and the group 13 element is 1.0 or more and less than 1.5.
    Type: Application
    Filed: July 8, 2016
    Publication date: September 21, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Fumiaki MERA, Nobuyuki TORIGOE, Masaki HIRAKATA, Hideya KATSUHARA, Yoichi KIGOSHI, Satomi KASHIWAGI, Yuko IWADATE, Kenji KAJIWARA, Tatsuki SANO, Takashi IMAI, Takeshi IWANAGA
  • METATITANIC ACID PARTICLE AND METHOD FOR PRODUCING THE SAME
    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
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, METHOD OF PREPARING ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, AND ELECTROSTATIC CHARGE IMAGE DEVELOPER
    Publication number: 20170255120
    Abstract: An electrostatic charge image developing carrier includes magnetic particles and a resin coating layer which covers the magnetic particles, wherein a sulfate ion concentration of the resin coating layer is 0.05% by weight or less with respect to a total weight of the resin coating layer, and when a total value of a molar amount of sulfate ions contained and a molar amount of sulfo groups contained per 1 g of the resin coating layer is A mol and a molar amount of sodium ions contained per 1 g of the resin coating layer is B mol, a relationship of 0.1<B/A<1.2 is satisfied.
    Type: Application
    Filed: July 29, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Toshiaki HASEGAWA, Takashi TANABE, Masaaki USAMI, Yasunobu KASHIMA, Takeshi IWANAGA
  • SILICA PARTICLE AND METHOD FOR PRODUCING THE SAME
    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
  • TITANIUM OXIDE PARTICLE AND METHOD FOR PRODUCING THE SAME
    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
  • ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20170242351
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an organic photosensitive layer on the conductive substrate, and an inorganic protective layer on the organic photosensitive layer. A layer that constitutes a surface of the organic photosensitive layer contains a charge transport material, a binder resin, silica particles, and a silicone compound.
    Type: Application
    Filed: July 6, 2016
    Publication date: August 24, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tatsuki SANO, Hideya KATSUHARA, Masaki HIRAKATA, Takeshi IWANAGA
  • Electrophotographic photoreceptor, process cartridge, and image forming apparatus
    Patent number: 9740115
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an organic photosensitive layer on the conductive substrate, and an inorganic protective layer on the organic photosensitive layer. A layer that constitutes a surface of the organic photosensitive layer contains a charge transport material, a binder resin, silica particles, and a silicone compound.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: August 22, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tatsuki Sano, Hideya Katsuhara, Masaki Hirakata, Takeshi Iwanaga
  • 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
  • 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 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