Patents by Inventor Teruki Senokuti

Teruki Senokuti 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: 8974998
    Abstract: A method of forming an image including an electrophotographic photoreceptor and a toner, wherein a photosensitive layer in the electrophotographic photoreceptor includes an undercoat layer including metal oxide particles, a charge generation layer including hydroxygallium phthalocyanine, and a charge transport layer, and the toner contains toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies—0.0517EXP(22.4/Dv50)?Dns?0.233EXP(17.3/Dv50) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Patent number: 8221950
    Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.3/Dv50)??(1).
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: July 17, 2012
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Patent number: 8211602
    Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.3/Dv50)??(1).
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: July 3, 2012
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20120045246
    Abstract: An image forming apparatus containing an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, where the electrophotographic photoreceptor has an undercoat layer containing metal oxide particles; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.
    Type: Application
    Filed: September 14, 2011
    Publication date: February 23, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Teruyuki MITSUMORI, Kozo ISHIO, Hiroaki TAKAMURA, Masaya OOTA, Shiho SANO, Takeshi OOWADA, Masakazu SUGIHARA, Teruki SENOKUTI, Shiro YASUTOMI, Yumi HIRABARU
  • Publication number: 20120039630
    Abstract: An image forming apparatus containing an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, where the electrophotographic photoreceptor has an electroconductive substrate with a surface roughness Ra of from 0.01 ?m to 0.3 ?m; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.
    Type: Application
    Filed: September 20, 2011
    Publication date: February 16, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Patent number: 8064796
    Abstract: To provide an image forming apparatus which is able to improve image quality while suppressing soiling of image white parts, scattering in the apparatus, streaks, fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor, and which has good cleaning properties, and even when a high speed printing machine is used, is able to reduce a problem of soiling, etc. in long-term use and provide excellent image stability.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: November 22, 2011
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Ota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20100316412
    Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.
    Type: Application
    Filed: August 3, 2010
    Publication date: December 16, 2010
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Teruyuki MITSUMORI, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20100316411
    Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.
    Type: Application
    Filed: August 3, 2010
    Publication date: December 16, 2010
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Teruyuki MITSUMORI, Kozo ISHIO, Hiroaki TAKAMURA, Masaya OOTA, Shiho SANO, Takeshi OOWADA, Masakazu SUGIHARA, Teruki SENOKUTI, Shiro YASUTOMI, Yumi HIRABARU
  • Publication number: 20090291379
    Abstract: To provide toner which is capable of suppressing consuming amount of toner and preventing cleaning failure, and even when a high speed printing machine is used, can reduce a problem of e.g. fogging in a long-term use and is excellent in image stability. A toner for developing an electrostatic charge image, which comprises toner matrix particles formed in an aqueous medium, wherein the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.
    Type: Application
    Filed: March 30, 2007
    Publication date: November 26, 2009
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20090180807
    Abstract: To provide an image forming apparatus which is able to improve image quality while suppressing soiling of image white parts, scattering in the apparatus, streaks, fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor, and which has good cleaning properties, and even when a high speed printing machine is used, is able to reduce a problem of soiling, etc. in long-term use and provide excellent image stability.
    Type: Application
    Filed: March 30, 2007
    Publication date: July 16, 2009
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20090053634
    Abstract: To provide a toner excellent in the image stability, whereby the image quality can be improved while suppressing soiling of image white parts, residual images (ghosts), fading (blotted image follow-up properties), etc., cleaning properties are good, and even when a high speed printing machine is used, it is possible to reduce a problem of soiling, etc. An image forming apparatus comprising an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, wherein a photosensitive layer of the electrophotographic photoreceptor contains a resin having a structural unit represented by the following formula (A); the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.
    Type: Application
    Filed: March 30, 2007
    Publication date: February 26, 2009
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
  • Publication number: 20090041500
    Abstract: To provide an image forming apparatus which is capable of suppressing soiling of image white parts, residual images (ghosts), fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor and which is able to improve image quality, provides good fixing properties and cleaning properties with little fogging or dot missing, presents good reproducibility of fine lines, and even when a high speed printing machine is used, can reduce a problem of e.g. soiling in a long-term use and presents excellent image stability.
    Type: Application
    Filed: March 30, 2007
    Publication date: February 12, 2009
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru