Patents by Inventor Hiroyuki Yasukawa

Hiroyuki Yasukawa 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: 20090291375
    Abstract: Disclosed is a process of forming a full color image according to electrophotography, employing a yellow toner, a magenta toner and a cyan colorant, the process comprising the step of forming a yellow toner image, a magenta toner image and a cyan toner image on a recording material, wherein the yellow toner image has reflectance (in terms of %) satisfying formulas (11) through (14) below, the magenta toner image has reflectance (in terms of %) satisfying formulas (21) through (24) below, and the cyan toner image has reflectance (in terms of %) satisfying formulas (31) through (34) below.
    Type: Application
    Filed: May 13, 2009
    Publication date: November 26, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Tatsuya FUJISAKI, Mikio KOUYAMA, Kenji HAYASHI, Hiroyuki YASUKAWA, Natsuko KUSAKA
  • Publication number: 20090291381
    Abstract: Provided is a toner comprising toner particles containing a binder resin and coloring matters, wherein the coloring matters comprise a dye represented by Formula (X-1), a metal compound represented by Formula (1) and a quinacridone pigment represented by Formula (2):
    Type: Application
    Filed: May 15, 2009
    Publication date: November 26, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Naohiro Hirose, Hiroyuki Yasukawa, Natsuko Kusaka, Miyuki Murakami, Yohei Ohno
  • Publication number: 20090258309
    Abstract: Provided is a toner for an electrostatic charge image development having toner particles which contain: a binder resin; a colorant; and a compound represented by Formula (1) in an amount of 0.1 to 65 ppm based on the total weight of the toner particles: wherein R1 and R2 each respectively represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 15, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Natsuko KUSAKA, Naohiro HIROSE, Tatsuya NAGASE, Hiroyuki YASUKAWA
  • Publication number: 20090162776
    Abstract: Disclosed is a magenta toner, which contains magenta colorants composed of compound A represented by Formulas (1), (2) or (3) in an amount of mA and compound B selected from a group consisting of a mono-azo pigment, a naphthol pigment and rhodamine chelate pigment in an amount of mA, and a ratio of amount mA:mB is 90:10 to 55:45. are described in the specification.
    Type: Application
    Filed: December 15, 2008
    Publication date: June 25, 2009
    Inventors: Kenji Hayashi, Mikio Kouyama, Hiroyuki Yasukawa, Hiroaki Obata, Natsuko Kusaka
  • Publication number: 20090123861
    Abstract: An electrophotographic toner containing a resin and a colorant is disclosed. The colorant is represented by the formula in the formula, M1 is a silicon atom (Si), a germanium atom (Ge) and a tin atom (Sn); Z is independently a chlorine atom, a hydroxy group, an alkoxy group having 1 to 8 carbon atoms, or an aryloxy group having 6 to 8 carbon atoms; and A1, A2, A3 and A4 are each independently an atomic group defined in the specification.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 14, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Mikio Kouyama, Kenji Hayashi, Tomoko Sakimura, Hiroyuki Yasukawa, Hiroaki Obata, Natsuko Kusaka
  • Publication number: 20090075192
    Abstract: Disclosed is a toner comprising a resin and a colorant, wherein the colorant comprises a compound represented by formula (I) and a compound represented by formula (II).
    Type: Application
    Filed: August 19, 2008
    Publication date: March 19, 2009
    Inventors: Kenji Hayashi, Mikio Kouyama, Tomoko Sakimura, Hiroyuki Yasukawa, Hiroaki Obata, Natsuko Kusaka
  • Patent number: 7501044
    Abstract: A paper making elastic belt has a drainage channels in a surface. A surface roughness of a wall of the drainage channel is not more than 2.0 ?m in arithmetic average roughness (Ra).
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: March 10, 2009
    Assignee: Yamauchi Corporation
    Inventors: Takahisa Hikida, Keiji Nakagawa, Hiroyuki Yasukawa
  • Publication number: 20080261141
    Abstract: A magenta toner for developing an electrostatic image composed of a binder and a colorant is disclosed. The toner contains a tone controlling agent having a peak of fluorescent spectrum from 380 to 500 nm. An image excellent in light fastness and durability can be obtained and high color reproducibility with sufficient transparency and chromaticness can be realized by the magenta toner.
    Type: Application
    Filed: March 7, 2008
    Publication date: October 23, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Hiroyuki YASUKAWA, Mikio KOUYAMA, Kenji HAYASHI, Hiroaki OBATA, Natsuko KUSAKA
  • Publication number: 20080171278
    Abstract: An electrostatic image developing toner which is capable of obtaining highly chromatic full-color images of bright color without causing perceived color contamination and exhibits superior lightfastness is disclosed, wherein the toner comprises a binding resin and a colorant, and the colorant is tetraazaporphyrin or phthalocyanine compounds such as a compound represented by the following formula:
    Type: Application
    Filed: October 16, 2007
    Publication date: July 17, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Hiroyuki YASUKAWA, Mikio KOUYAMA, Kenji HAYASHI, Tomoko SAKIMURA, Hiroaki OBATA, Natsuko KUSAKA
  • Publication number: 20080113284
    Abstract: An electrostatic image forming method is described. The method includes forming latent images corresponding to yellow, magenta and cyan images on a photoreceptor, developing corresponding latent images by developers containing yellow, magenta and cyan toner to form yellow, magenta and cyan images and transferring the yellow, magenta and cyan images on a recording material, and the yellow toner and the magenta have specific reflectance characteristics described in the specification.
    Type: Application
    Filed: October 31, 2007
    Publication date: May 15, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Kenji HAYASHI, Mikio KOUYAMA, Hiroyuki YASUKAWA, Hiroaki OBATA, Natsuko KUSAKA, Tatsuya FUJISAKI
  • Publication number: 20070184375
    Abstract: An object is to provide an electrostatic charge image developing toner and an image forming method using the same capable of maintaining image properties for a long duration, which exhibit not only sufficient transparency and chromaticness, accompanied with high color reproduction and excellent charging characteristic, but also excellent heat resistance, together further with excellent light fastness and sufficient image holding ability. Disclosed is an electrostatic charge image developing toner of the present invention comprising a binder resin for toner particle formation and colorant particles dispersed in the binder resin, wherein the colorant particles comprise a dye and an antioxidant. Further, the electrostatic charge image developing toner wherein a volume-based median particle diameter of the colorant particles is preferably 10-100 nm, and also the dye contained in the colorant particles is preferably an oil-soluble dye or a metal chelate dye.
    Type: Application
    Filed: December 1, 2006
    Publication date: August 9, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Hidetaka NINOMIYA, Mikio KOUYAMA, Takato CHIBA, Kenji HAYASHI, Hiroyuki YASUKAWA
  • Publication number: 20060166119
    Abstract: A method for producing an electrophotographic toner comprising the step of polymerizing two or more polymerizable monomers under existence of a non-polar liquid hydrocarbon, wherein at least one the polymerizable monomers comprises a polar group; a dynamic viscosity of the liquid hydrocarbon at 40° C. is in the range of 7-300 mm2/s.
    Type: Application
    Filed: January 17, 2006
    Publication date: July 27, 2006
    Inventors: Kenji Hayashi, Mikio Koyama, Hiroyuki Yasukawa
  • Publication number: 20060113052
    Abstract: A paper making elastic belt has a drainage channels in a surface. A surface roughness of a wall of the drainage channel is not more than 2.0 ?m in arithmetic average roughness (Ra).
    Type: Application
    Filed: November 29, 2005
    Publication date: June 1, 2006
    Inventors: Takahisa Hikida, Keiji Nakagawa, Hiroyuki Yasukawa
  • Patent number: 6800431
    Abstract: There is disclosed photothermographic material exhibiting superior photographic performance and having improved latitude for variation in thermal developing conditions, comprising on a support an organic silver salt, light-sensitive silver halide and a reducing agent for silver ions, wherein the reducing agent is represented by the following formula in which R1 through R4, L1, X1, X2 n and m have the meaning stated in the specification.
    Type: Grant
    Filed: April 15, 2003
    Date of Patent: October 5, 2004
    Assignee: Konica Corporation
    Inventors: Norio Miura, Ryohei Iwamoto, Kazuaki Nakamura, Hiroyuki Yasukawa, Kiyoshi Fukusaka
  • Publication number: 20030219686
    Abstract: There is disclosed photothermographic material exhibiting superior photographic performance and having improved latitude for variation in thermal developing conditions, comprising on a support an organic silver salt, light-sensitive silver halide and a reducing agent for silver ions, wherein the reducing agent is represented by the following formula 1
    Type: Application
    Filed: April 15, 2003
    Publication date: November 27, 2003
    Inventors: Norio Miura, Ryohei Iwamoto, Kazuaki Nakamura, Hiroyuki Yasukawa, Kiyoshi Fukusaka
  • Patent number: 5945268
    Abstract: Disclosed is a silver halide color photographic light sensitive material comprising a coupler represented by the following formula (I):formula (I) ##STR1## wherein Cp represents a coupler moiety; L represents a divalent linkage group; J represents --CO-- or --SO.sub.2 --; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a hydrogen atom, an alkyl group or an aryl group, provided that one of R.sub.3 and R.sub.4 is a hydrogen atom; R.sub.5 represents a substituent; and n represents 0 or 1.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: August 31, 1999
    Assignee: Konica Corporation
    Inventors: Koji Daifuku, Hiroyuki Yasukawa, Kohichi Takabe, Ryohei Iwamoto, Satoru Ikesu