Patents by Inventor Akiko Kitao

Akiko Kitao 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: 20210132519
    Abstract: A toner includes a toner particle containing a binder resin and an inorganic infrared absorbent particle, wherein (1) in spectrometry of a fixed image obtained by fixing an unfixed image formed on a recording material by using the toner in a loading amount of 0.30 mg/cm2, a maximum value of a light absorbance in a wavelength range of 400 nm or more and 800 nm or less is 10% or less, and (2) in cross section observation of the toner particle using a transmission electron microscope, when a circle having the center of gravity of a cross section image of the toner particle as the center thereof and having a radius of 2.0 ?m is drawn and the circle is divided into four to form four quadrants, a coefficient of variation in number of the inorganic infrared absorbent particles observed in each quadrant is 0.50 or less.
    Type: Application
    Filed: December 31, 2020
    Publication date: May 6, 2021
    Inventors: Akira Hashimoto, Takeshi Yamamoto, Ryuji Higashi, Takayuki Toyoda, Maki Okajima, Akiko Kitao, Koichi Suzuki
  • Publication number: 20200407572
    Abstract: A heat sensitive transfer sheet that achieves high optical density and high light resistance without generating scumming. The heat sensitive sheet has a base material and a coloring material layer formed on the base material, and the coloring material layer includes a compound represented by the following formula (1) and a particular dye compound: wherein R11 and R13 each independently represent a hydrogen atom, an alkyl group, an aralkyl group, an unsubstituted aryl group or an aryl group having a substituent; and R12 and R14 to R18 each independently represent a hydrogen atom or an alkyl group.
    Type: Application
    Filed: June 23, 2020
    Publication date: December 31, 2020
    Inventors: Takeshi Sekiguchi, Akiko Kitao, Ai Hayakawa
  • Publication number: 20200270463
    Abstract: The modified graphene includes a structure represented by the following formula (I), wherein the modified graphene has a ratio (g/d) of an intensity “g” of a G band to an intensity “d” of a D band of 1.0 or more in a Raman spectroscopy spectrum thereof: Gr1-Ar1-X1-(Y1)n1??(I) in the formula (I), Gr1 represents a single-layer graphene or a multilayer graphene, Ar1 represents an arylene group having 6 to 18 carbon atoms, X1 represents a single bond, a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms, or a group obtained by substituting at least one carbon atom in a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms with at least one structure selected from the group consisting of —O—, —NH—, —CO—, —COO—, —CONH—, and an arylene group.
    Type: Application
    Filed: February 18, 2020
    Publication date: August 27, 2020
    Inventors: Taiki Watanabe, Akiko Kitao, Koichi Suzuki, Yuma Kobayashi
  • Patent number: 10678156
    Abstract: A pigment dispersion has low viscosity and good dispersion property without depending on pigment species. The pigment dispersion contains a dispersion medium, an organic pigment, and a triazo compound having a specific structure.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: June 9, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akiko Kitao, Ai Hayakawa, Koichi Suzuki, Ryuji Higashi, Taiki Watanabe
  • Publication number: 20180275545
    Abstract: A pigment dispersion has low viscosity and good dispersion property without depending on pigment species. The pigment dispersion contains a dispersion medium, an organic pigment, and a triazo compound having a specific structure.
    Type: Application
    Filed: March 22, 2018
    Publication date: September 27, 2018
    Inventors: Akiko Kitao, Ai Hayakawa, Koichi Suzuki, Ryuji Higashi, Taiki Watanabe
  • Patent number: 9751872
    Abstract: This invention aims at providing a compound capable of providing a toner having high covering power and a toner having high covering power, which is achieved by an azamethine acetyl amide-based compound having a specific structure.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: September 5, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Akiko Kitao
  • Publication number: 20170001992
    Abstract: This invention aims at providing a compound capable of providing a toner having high covering power and a toner having high covering power, which is achieved by an azamethine acetyl amide-based compound having a specific structure.
    Type: Application
    Filed: June 29, 2016
    Publication date: January 5, 2017
    Inventor: Akiko Kitao
  • Publication number: 20160363879
    Abstract: This invention provides a toner excellent in color development properties. The purpose can be achieved by using a toner containing a compound having a specific structure.
    Type: Application
    Filed: June 8, 2016
    Publication date: December 15, 2016
    Inventors: Akira Tsuboyama, Akiko Kitao, Takeshi Sekiguchi
  • Patent number: 9244373
    Abstract: The present invention provides a toner that exhibits an excellent chromogenicity and provides a method of producing a toner that has an excellent particle size distribution and an excellent chromogenicity, in which a toner containing a binder resin and a colorant that contains a coloring compound with general formula (1), and a method of producing this toner.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: January 26, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Akiko Kitao, Ryuji Higashi, Taichi Shintou, Takeshi Miyazaki
  • Patent number: 9146486
    Abstract: The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1, R2, R6 represent an alkyl group, R3 to R5 represent an alkyl group, or satisfy either of the following conditions i) and ii): i) R3, R4 are bonded to each other, so as to form a cyclic organic functional group, and R5 represents an alkyl group; ii) R3 to R5 are bonded to one another, so as to form a cyclic organic functional group R7, R8 represent an alkyl group or an acyl group, or R7, R8 are bonded to each other, so as to form a cyclic organic functional group.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: September 29, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Taichi Shintou, Akiko Kitao, Yuko Katsumoto, Takeshi Miyazaki
  • Publication number: 20150232678
    Abstract: An ink jet aqueous ink including particles of a compound represented by the following general formula (I); a dispersant for dispersing the particles; and water, where, in the general formula (I), R1 and R2 each independently represent an alkyl group, R3 represents an alkyl group or an aryl group, R4 represents an alkyl group, and X represents an alkyl group or a group represented by NR5R6, where R5 and R6 each independently represent a hydrogen atom, an alkyl group, or an acyl group.
    Type: Application
    Filed: February 12, 2015
    Publication date: August 20, 2015
    Inventors: Taketoshi Okubo, Kenichi Iida, Hiroya Nitta, Akiko Kitao
  • Patent number: 9069274
    Abstract: The present invention provides a toner excellent in light resistance. The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1 and R2 each independently represent an alkyl group or an acyl group, or R1 and R2 may be bonded to each other so as to form a cyclic organic functional group containing, as a hetero atom, a nitrogen atom to which R1 and R2 are bonded; R3 and R4 each independently represent an alkyl group; R5 and R6 each independently represent an alkyl group or an alkoxy group; R7 represents a hydrogen atom, an alkyl group or an alkoxy group; and R8 represents an alkyl group.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: June 30, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuko Katsumoto, Akiko Kitao, Taichi Shintou, Takeshi Miyazaki
  • Publication number: 20150159019
    Abstract: The present invention provides a coloring compound that exhibits an excellent chromogenicity and provides an ink, a color filter resist composition, and a thermal transfer recording ink sheet that contain this coloring compound. The coloring compound has the structure represented by general formula (1), and the ink, color filter resist composition, and thermal transfer recording ink sheet contain this coloring compound.
    Type: Application
    Filed: August 21, 2013
    Publication date: June 11, 2015
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akiko Kitao, Ryuji Higashi, Taichi Shintou, Takeshi Miyazaki
  • Publication number: 20150125792
    Abstract: The present invention provides a phthalocyanine pigment having superior color development property, and a pigment dispersion, an ink and a color filter resist composition containing the phthalocyanine pigment, in which the phthalocyanine pigment having a structure represented by general formula (1), and the pigment dispersion, the ink and the color filter resist composition containing the phthalocyanine pigment.
    Type: Application
    Filed: August 21, 2013
    Publication date: May 7, 2015
    Inventors: Ryuji Higashi, Akiko Kitao, Taichi Shintou, Takeshi Miyazaki
  • Patent number: 8974708
    Abstract: The coloring matter compound is represented by the following general formula (1): wherein R1, R2, R6 represent an alkyl group; R3 to R5 represent an alkyl group, or satisfy either of the following conditions i) and ii): i) R3 and R4 are bonded to each other, so as to form a cyclic organic functional group containing R3, R4 and a carbon atom bonded to R3 and R4, and R5 represents an alkyl group; ii) R3 to R5 are bonded to one another, so as to form a cyclic organic functional group containing R3, R4, R5 and a carbon atom bonded to R3 to R5; and R7, R8 represent an alkyl group or an acyl group, or R7 and R8 are bonded to each other, so as to form a cyclic organic functional group containing R7, R8 and a nitrogen atom bonded simultaneously to R7 and R8.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: March 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Taichi Shintou, Yuko Katsumoto, Akiko Kitao, Takeshi Miyazaki
  • Patent number: 8940087
    Abstract: The coloring matter compound is represented by the following general formula (1): wherein R1 and R2 each independently represent an alkyl group or an acyl group, or R1 and R2 may be bonded to each other so as to form a cyclic organic functional group containing, as a hetero atom, a nitrogen atom to which R1 and R2 are bonded; R3 and R4 each independently represent an alkyl group; R5 and R6 each independently represent an alkyl group or an alkoxy group; R7 represents a hydrogen atom, an alkyl group or an alkoxy group; and R8 represents an alkyl group.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: January 27, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuko Katsumoto, Taichi Shintou, Akiko Kitao, Takeshi Miyazaki
  • Patent number: 8927185
    Abstract: The present invention provides a toner having superior color development property and a method of producing a toner having favorable particle size distribution and color development property, in which the toner containing a binder resin and a colorant that contains a phthalocyanine pigment represented by general formula (1), and the method for producing the toner.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: January 6, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryuji Higashi, Akiko Kitao, Taichi Shintou, Takeshi Miyazaki
  • Publication number: 20140170552
    Abstract: The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1, R2, R6 represent an alkyl group, R3 to R5 represent an alkyl group, or satisfy either of the following conditions i) and ii): i) R3, R4 are bonded to each other, so as to form a cyclic organic functional group, and R5 represents an alkyl group; ii) R3 to R5 are bonded to one another, so as to form a cyclic organic functional group R7, R8 represent an alkyl group or an acyl group, or R7, R8 are bonded to each other, so as to form a cyclic organic functional group.
    Type: Application
    Filed: February 18, 2014
    Publication date: June 19, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Taichi Shintou, Akiko Kitao, Yuko Katsumoto, Takeshi Miyazaki
  • Publication number: 20140158955
    Abstract: The coloring matter compound is represented by the following general formula (1): wherein R1 and R2 each independently represent an alkyl group or an acyl group, or R1 and R2 may be bonded to each other so as to form a cyclic organic functional group containing, as a hetero atom, a nitrogen atom to which R1 and R2 are bonded; R3 and R4 each independently represent an alkyl group; R5 and R6 each independently represent an alkyl group or an alkoxy group; R7 represents a hydrogen atom, an alkyl group or an alkoxy group; and R8 represents an alkyl group.
    Type: Application
    Filed: February 14, 2014
    Publication date: June 12, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuko Katsumoto, Taichi Shintou, Akiko Kitao, Takeshi Miyazaki
  • Publication number: 20140162183
    Abstract: The present invention provides a toner excellent in light resistance. The toner includes toner base particles, each of which contains a binder resin, a wax and a coloring agent, and a coloring matter compound represented by the general formula (1) is contained as the coloring agent. wherein R1 and R2 each independently represent an alkyl group or an acyl group, or R1 and R2 may be bonded to each other so as to form a cyclic organic functional group containing, as a hetero atom, a nitrogen atom to which R1 and R2 are bonded; R3 and R4 each independently represent an alkyl group; R5 and R6 each independently represent an alkyl group or an alkoxy group; R7 represents a hydrogen atom, an alkyl group or an alkoxy group; and R8 represents an alkyl group.
    Type: Application
    Filed: February 18, 2014
    Publication date: June 12, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuko Katsumoto, Akiko Kitao, Taichi Shintou, Takeshi Miyazaki