Patents by Inventor Shigeru Seitoku

Shigeru Seitoku 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).

  • Publication number: 20120015291
    Abstract: An electrostatic image developing carrier includes a core particle and a coating layer on the core particle. The coating layer contains a resin having a crosslinked structure formed by using at least one compound selected from boric acid and boric acid derivatives.
    Type: Application
    Filed: March 14, 2011
    Publication date: January 19, 2012
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Susumu YOSHINO, Sumiaki YAMASAKI, Satoshi HIRAOKA, Shigeru SEITOKU, Hirofumi SHIOZAKI, Kazuhiko YANAGIDA
  • Publication number: 20100330484
    Abstract: Black particles include a black pigment; and a cyan pigment, wherein when the reflectance to light of wavelength of 420 nm and the reflectance to light of wavelength of 770 nm of plural samples are measured, the standard deviations (1?) of the measured values are about 1 or less with respect to both wavelengths.
    Type: Application
    Filed: December 4, 2009
    Publication date: December 30, 2010
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Shigeru SEITOKU
  • Publication number: 20090011354
    Abstract: The invention relates to an electrostatic image developing toner comprising at least one of a phthalocyanine type compound and a naphthalocyanine type compound and at least one compound represented by the following structural formulae (1) to (10): wherein R1 to R57 respectively represent a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, an amino group, a halogen group, an alkoxy group, an alkylthio group, a nitro group, a hydroxy group, a thiol group, an alkylcarbonyl group, an alkoxycarbonyl group, an alkylcarbonylamino group, an alkoxycarbonylamino group, a carboxyamide group or a nitroimino group, wherein among R1 to R57, any two adjacent Rs may form a carbon ring and any two Rs connected to the same carbon atom may form an oxo group, an imino group or a thioxo group.
    Type: Application
    Filed: April 10, 2008
    Publication date: January 8, 2009
    Applicant: Fuji Xerox Co., Ltd.
    Inventor: Shigeru SEITOKU
  • Patent number: 7288351
    Abstract: A magenta toner for developing electrostatic images provided which contains a binder resin and a colorant, wherein the colorant includes a mixed crystal of two or more colorants and when a solid patch is fixed on art paper complying with the ISO standard by using this toner, a resulting fixed image color satisfies at least one of the following formulae (b*)<0.85 (a*)?67.92; and (b*)>?7.94(a*)+591.85. The color difference ?E between the color of the fixed image and the color characterized by L*: 46.6, a*: 75.1 and b*: ?4.4 is preferably less than 6. The colorant is preferably a mixed crystal of a quinacridone colorant and a monoazo colorant. Moreover, the invention provides a method for producing the magenta toner, a developer containing the magenta toner, and an image-forming method using the magenta toner.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: October 30, 2007
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidekazu Yaguchi, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku
  • Patent number: 7166401
    Abstract: The present invention provides a toner for electrophotography comprising a binder resin, a coloring agent and a release agent, wherein the toner has a storage modulus G? of 5.0×102 to 1.0×105 Pa at 180° C. and an adhesive force to an aluminum substrate of not more than 50 N/m at 180° C. The invention also provides an image-forming method, which includes charging a surface of an image-bearing body; forming an electrostatic latent image according to image information on the charged surface of the image-bearing body; developing the electrostatic latent image formed on the surface of the image-bearing body with the toner to provide a toner image; transferring the toner image formed on the surface of the image-bearing body to a surface of a recording medium, and fusing the toner image transferred on the surface of the recording medium.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: January 23, 2007
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hiroyuki Tanaka, Shuji Sato, Yosuke Tsurumi, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku, Kazuhiko Yanagida
  • Patent number: 7094514
    Abstract: The present invention relates to an image forming method wherein the surface of an electrophotographic photoreceptor contains a compound having an unsaturated double bond, a toner for electrostatic latent image development has a binder resin obtained by polymerizing a polymerizable monomer having a vinyl double bond, has at least one kind of metal oxide particles and/or metal nitride particles on the surface of the toner and has a shape factor SF1 of 110 to 140, and the storage of elastic modulus at 160° C. (G?(160)) of the toner for electrostatic latent image development is in a predetermined range.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: August 22, 2006
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Kazuhiko Yanagida, Shigeru Seitoku, Yasuo Matsumura, Sueko Sakai, Hiroyuki Tanaka
  • Patent number: 7018764
    Abstract: The present invention relates to a toner for developing electrostatic images characterized in that a reactive polymer which cross-links when heated at a temperature higher than a maximum temperature at the preparation of the toner for developing electrostatic images, at image fixation and/or after fixation, is contained in a toner for developing electrostatic images containing at least a binder resin, and/or is added to the surface thereof.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: March 28, 2006
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Takahisa Fujii, Tsutomu Kubo, Shigeru Seitoku
  • Patent number: 6942953
    Abstract: The present invention provides an image forming method comprising the steps of forming an electrostatic latent image on a surface of an electrostatic latent image bearing body, forming a toner image by developing the electrostatic latent image by using a toner, transferring the toner image to the surface of a recording medium, and fusing the transferred toner image on the surface of the recording medium by bringing the toner image into contact with a heating medium, which has a resin coating layer formed on the surface thereof, and thereby melting the toner image. The toner contains a binder resin containing monomers having vinyl double bonds. A storage elasticity of the toner at 180° C. is in a range of 1×103 to 8×103 Pa and a contact angle of the surface of the heating medium to water at 25° C. is in a range of 50 to 100°.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: September 13, 2005
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Hiroyuki Tanaka, Shigeru Seitoku, Kazuhiko Yanagida, Yasuo Matsumura, Shuji Sato
  • Publication number: 20050008963
    Abstract: The present invention provides a toner for electrophotography comprising a binder resin, a coloring agent and a release agent, wherein the toner has a storage modulus G? of 5.0×102 to 1.0×105 Pa at 180° C. and an adhesive force to an aluminum substrate of not more than 50 N/m at 180° C. The invention also provides an image-forming method, which includes charging a surface of an image-bearing body; forming an electrostatic latent image according to image information on the charged surface of the image-bearing body; developing the electrostatic latent image formed on the surface of the image-bearing body with the toner to provide a toner image; transferring the toner image formed on the surface of the image-bearing body to a surface of a recording medium, and fusing the toner image transferred on the surface of the recording medium.
    Type: Application
    Filed: March 3, 2004
    Publication date: January 13, 2005
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hiroyuki Tanaka, Shuji Sato, Yosuke Tsurumi, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku, Kazuhiko Yanagida
  • Publication number: 20050008960
    Abstract: A magenta toner for developing electrostatic images provided which contains a binder resin and a colorant, wherein the colorant includes a mixed crystal of two or more colorants and when a solid patch is fixed on art paper complying with the ISO standard by using this toner, a resulting fixed image color satisfies at least one of the following formulae (b*)<0.85 (a*)?67.92; and (b*)>?7.94(a*)+591.85. The color difference ?E between the color of the fixed image and the color characterized by L*: 46.6, a*: 75.1 and b*: ?4.4 is preferably less than 6. The colorant is preferably a mixed crystal of a quinacridone colorant and a monoazo colorant. Moreover, the invention provides a method for producing the magenta toner, a developer containing the magenta toner, and an image-forming method using the magenta toner.
    Type: Application
    Filed: March 8, 2004
    Publication date: January 13, 2005
    Applicant: FUJI XEROX., LTD.
    Inventors: Hidekazu Yaguchi, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku
  • Publication number: 20040253530
    Abstract: The present invention provides an image forming method comprising the steps of forming an electrostatic latent image on a surface of an electrostatic latent image bearing body, forming a toner image by developing the electrostatic latent image by using a toner, transferring the toner image to the surface of a recording medium, and fusing the transferred toner image on the surface of the recording medium by bringing the toner image into contact with a heating medium, which has a resin coating layer formed on the surface thereof, and thereby melting the toner image. The toner contains a binder resin containing monomers having vinyl double bonds. A storage elasticity of the toner at 180° C. is in a range of 1×103 to 8×103 Pa and a contact angle of the surface of the heating medium to water at 25° C. is in a range of 50 to 100°.
    Type: Application
    Filed: December 17, 2003
    Publication date: December 16, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Hiroyuki Tanaka, Shigeru Seitoku, Kazuhiko Yanagida, Yasuo Matsumura, Shuji Sato
  • Publication number: 20040191662
    Abstract: The present invention provides: a toner for developing electrostatic images including as a main component thereof a binder resin having a copolymer comprised of a combination of a high Tg monomer having a structure represented by the following structural formula (1) and a glass transition temperature of 50° C. or higher, a low Tg monomer having a structure represented by the following structural formula (2) and a glass transition temperature of lower than 50° C., and a hydrophilic monomer having a structure represented by the following structural formula (3); a process for preparing the toner for developing electrostatic images; a developer for developing electrostatic images containing the toner; and an image forming method using the toner.
    Type: Application
    Filed: September 10, 2003
    Publication date: September 30, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Shigeru Seitoku
  • Publication number: 20040185367
    Abstract: The present invention relates to an image forming method wherein the surface of an electrophotographic photoreceptor contains a compound having an unsaturated double bond, a toner for electrostatic latent image development has a binder resin obtained by polymerizing a polymerizable monomer having a vinyl double bond, has at least one kind of metal oxide particles and/or metal nitride particles on the surface of the toner and has a shape factor SF1 of 110 to 140, and the storage of elastic modulus at 160° C. (G′(160)) of the toner for electrostatic latent image development is in a predetermined range.
    Type: Application
    Filed: September 12, 2003
    Publication date: September 23, 2004
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Kazuhiko Yanagida, Shigeru Seitoku, Yasuo Matsumura, Sueko Sakai, Hiroyuki Tanaka
  • Publication number: 20040058266
    Abstract: The present invention relates to a toner for developing electrostatic images characterized in that a reactive polymer which cross-links when heated at a temperature higher than a maximum temperature at the preparation of the toner for developing electrostatic images, at image fixation and/or after fixation, is contained in a toner for developing electrostatic images containing at least a binder resin, and/or is added to the surface thereof.
    Type: Application
    Filed: June 19, 2003
    Publication date: March 25, 2004
    Applicant: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Takahisa Fujii, Tsutomu Kubo, Shigeru Seitoku