Patents by Inventor Narumasa SATO

Narumasa SATO 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: 9470994
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent with respect to the entire release agent is present within 800 nm from the surface of the toner particles, wherein the styrene (meth)acrylic resin forms domains having an average diameter of 0.3 ?m to 0.8 ?m in the toner particles, and wherein a number ratio of the domains included in a range of the average diameter±0.1 ?m is less than 65%.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: October 18, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kotaro Yoshihara, Noriyuki Mizutani, Tomoaki Tanaka, Eisuke Iwazaki, Asafumi Fujita, Narumasa Sato, Erina Saito
  • Patent number: 9304423
    Abstract: An electrostatic charge image developing toner includes toner particles containing an amorphous polyester resin (a1), a crystalline polyester resin (a2), and a styrene-acrylic resin (b) containing 2-carboxyethyl acrylate as a polymerization component.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: April 5, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Eisuke Iwazaki, Narumasa Sato, Asafumi Fujita, Kotaro Yoshihara, Noriyuki Mizutani, Tomoaki Tanaka
  • Patent number: 9304419
    Abstract: An electrostatic charge image developing toner has toner particles that contain a binder resin containing a polyester resin, a release agent containing hydrocarbon-based wax, styrene(meth)acrylic resin particles, and an aluminum element, wherein fluorescent X-ray NET intensity of the aluminum element existing in the toner particles is from 0.1 to 0.3, and 70% or more of the release agent among the entire release agent exists within 800 nm from the surface of the toner particles.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: April 5, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Narumasa Sato, Kotaro Yoshihara, Eisuke Iwazaki, Tomoaki Tanaka, Asafumi Fujita, Noriyuki Mizutani
  • Publication number: 20160085168
    Abstract: An electrostatic charge image developing toner, includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene(meth)acrylic resin, wherein 70% or more of the release agent is present within 800 nm from a surface of the toner particles, the styrene(meth)acrylic resin in the toner particles forms a domain having an average diameter from 0.3 ?m to 0.8 ?m, and a number ratio of the domain being in a range of ±0.1 ?m of the average diameter is 65% or more.
    Type: Application
    Filed: February 4, 2015
    Publication date: March 24, 2016
    Inventors: Eisuke IWAZAKI, Asafumi FUJITA, Tomoaki TANAKA, Narumasa SATO, Kotaro YOSHIHARA, Noriyuki MIZUTANI
  • Publication number: 20160085166
    Abstract: An electrostatic charge image developing toner includes a toner particle including a binder resin containing a polyester resin, a release agent containing hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent of the entire release agent is present in a portion within 800 nm from the surface of the toner particle, and wherein the styrene (meth)acrylic resin forms a domain having an average diameter of smaller than 0.3 ?m in the toner particle.
    Type: Application
    Filed: February 9, 2015
    Publication date: March 24, 2016
    Inventors: Tomoaki TANAKA, Kotaro YOSHIHARA, Eisuke IWAZAKI, Narumasa SATO, Asafumi FUJITA, Noriyuki MIZUTANI
  • Publication number: 20160085167
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent with respect to the entire release agent is present within 800 nm from the surface of the toner particles, wherein the styrene (meth)acrylic resin forms domains having an average diameter of 0.3 ?m to 0.8 ?m in the toner particles, and wherein a number ratio of the domains included in a range of the average diameter ±0.1 ?m is less than 65%.
    Type: Application
    Filed: February 18, 2015
    Publication date: March 24, 2016
    Inventors: Kotaro YOSHIHARA, Noriyuki MIZUTANI, Tomoaki TANAKA, Eisuke IWAZAKI, Asafumi FUJITA, Narumasa SATO, Erina SAITO
  • Publication number: 20160070186
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin having a polyester resin and a styrene-(meth)acrylic acid alkyl copolymer resin, a release agent having a hydrocarbon release agent, and an oligomer which includes a styrene structure and whose content is in a range of 1% by weight to 6% by weight with respect to toner particles.
    Type: Application
    Filed: February 2, 2015
    Publication date: March 10, 2016
    Inventors: Erina SAITO, Noriyuki MIZUTANI, Daisuke ISHIZUKA, Kotaro YOSHIHARA, Yuki TAKAMIYA, Narumasa SATO, Yuka KAWAMOTO
  • Publication number: 20160026104
    Abstract: An electrostatic charge image developing toner includes toner particles containing crosslinked resin particles having a glass transition temperature of 55° C. or higher in a surface layer of the toner particle, and silica particles having a volume average particle diameter of 30 nm to 300 nm and a coverage with respect to the toner particle from 50% to 100%.
    Type: Application
    Filed: January 20, 2015
    Publication date: January 28, 2016
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Asafumi FUJITA, Narumasa SATO, Eisuke IWAZAKI, Tomoaki TANAKA, Kotaro YOSHIHARA, Noriyuki MIZUTANI
  • Publication number: 20150268573
    Abstract: An electrostatic charge image developing toner includes toner particles containing an amorphous polyester resin (a1), a crystalline polyester resin (a2), and a styrene-acrylic resin (b) containing 2-carboxyethyl acrylate as a polymerization component.
    Type: Application
    Filed: August 11, 2014
    Publication date: September 24, 2015
    Inventors: Eisuke IWAZAKI, Narumasa SATO, Asafumi FUJITA, Kotaro YOSHIHARA, Noriyuki MIZUTANI, Tomoaki TANAKA
  • Publication number: 20150220009
    Abstract: An electrostatic charge image developing toner has toner particles that contain a binder resin containing a polyester resin, a release agent containing hydrocarbon-based wax, styrene(meth)acrylic resin particles, and an aluminum element, wherein fluorescent X-ray NET intensity of the aluminum element existing in the toner particles is from 0.1 to 0.3, and 70% or more of the release agent among the entire release agent exists within 800 nm from the surface of the toner particles.
    Type: Application
    Filed: August 12, 2014
    Publication date: August 6, 2015
    Inventors: Narumasa SATO, Kotaro YOSHIHARA, Eisuke IWAZAKI, Tomoaki TANAKA, Asafumi FUJITA, Noriyuki MIZUTANI
  • Patent number: 9058001
    Abstract: An image forming apparatus includes a toner image forming unit that forms and continuously transfers a toner image based on image data onto a transported sheet from the front to the rear in a sheet transport direction as the sheet is transported, a fixing unit positioned downstream of the toner image forming unit in the transport direction and that fixes the transferred toner image onto the sheet, an image determining unit that determines whether the formed toner image is a scattering toner image that causes toner scattering during the transfer, and a speed controlling unit that controls, when it is determined that the toner image is a scattering toner image, a transport speed of the sheet and a transfer speed of the toner image to the sheet such that the speeds are slower than those when it is determined that the toner image is not a scattering toner image.
    Type: Grant
    Filed: July 5, 2013
    Date of Patent: June 16, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Narumasa Sato, Eiji Nakai, Katsuyuki Kitajima, Makoto Kamisaki, Toyofumi Inoue, Takafumi Koide, Masataka Kuribayashi, Yoshinari Ueno, Yoshifumi Eri
  • Publication number: 20140112677
    Abstract: An image forming apparatus includes a toner image forming unit that forms and continuously transfers a toner image based on image data onto a transported sheet from the front to the rear in a sheet transport direction as the sheet is transported, a fixing unit positioned downstream of the toner image forming unit in the transport direction and that fixes the transferred toner image onto the sheet, an image determining unit that determines whether the formed toner image is a scattering toner image that causes toner scattering during the transfer, and a speed controlling unit that controls, when it is determined that the toner image is a scattering toner image, a transport speed of the sheet and a transfer speed of the toner image to the sheet such that the speeds are slower than those when it is determined that the toner image is not a scattering toner image.
    Type: Application
    Filed: July 5, 2013
    Publication date: April 24, 2014
    Inventors: Narumasa SATO, Eiji Nakai, Katsuyuki Kitajima, Makoto Kamisaki, Toyofumi Inoue, Takafumi Koide, Masataka Kuribayashi, Yoshinari Ueno, Yoshifumi Eri