Patents by Inventor Yuya KUBO
Yuya KUBO 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).
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Patent number: 11803132Abstract: The toner for developing an electrostatic charge image of the present invention contains a toner base particle comprising a binder resin and at least two kinds of organic pigments, and strontium titanate as an external additive.Type: GrantFiled: July 9, 2021Date of Patent: October 31, 2023Assignee: KONICA MINOLTA, INC.Inventors: Takanari Kayamori, Yuya Kubo, Shiro Hirano
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Patent number: 11768447Abstract: The toner for developing an electrostatic charge image of the present invention contains a toner base particle comprising a binder resin and at least two kinds of organic pigments, and alumina as an external additive. The at least two kinds of organic pigments comprises: a pigment P1 having an absorption maximum wavelength ?max (nm) of greater than 400 nm and less than 600 nm when dispersed in methyl ethyl ketone; and a pigment P2 having an absorption maximum wavelength ? max (nm) of 600 nm or more and 700 nm or less when dispersed in methyl ethyl ketone.Type: GrantFiled: July 9, 2021Date of Patent: September 26, 2023Assignee: KONICA MINOLTA, INC.Inventors: Shiro Hirano, Takanari Kayamori, Yuya Kubo
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Publication number: 20220397837Abstract: A two-component developer includes an electrostatic image developing toner and a carrier, and the electrostatic image developing toner contains toner particles having toner base particles and an external additive. The toner base particles contain a colorant, the colorant contains a pigment P1 and a pigment P2, the absorption maximum wavelength ?max of the pigments P1 and P2 each in dispersion in methyl ethyl ketone is, 400 nm or more and less than 600 nm for the pigment P1 and 600 nm or more and 700 nm or less for the pigment P2, the external additive contains titanium oxide, the content of the titanium oxide is 0.01% by mass or more and less than 1.00% by mass based on the total mass of the toner base particles, and the iron element content (atomic %) of the surface of the carrier as measured by X-ray electron spectroscopy satisfies a specific expression.Type: ApplicationFiled: May 26, 2022Publication date: December 15, 2022Inventors: Takanari KAYAMORI, Yuya KUBO
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Publication number: 20220350269Abstract: Disclosed is an electrostatic charge image developing toner including: toner base particles containing at least a binder resin and a magnetic material; and an external additive, wherein the binder resin contains a crystalline resin; and the external additive contains strontium titanate particles doped with metal elements other than titanium and strontium.Type: ApplicationFiled: April 21, 2022Publication date: November 3, 2022Inventors: Yuya KUBO, Takanari KAYAMORI, Naoya TONEGAWA, Noboru UEDA
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Patent number: 11320757Abstract: An image forming method includes forming an image by transferring and fixing white toner and color toner of at least one color to a recording medium, wherein when an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the white toner are Tmw (° C.) and Tspw (° C.), respectively, and an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the color toner are Tmc (° C.) and Tspc (° C.), respectively, Equations (1) and (2) below are satisfied: [Math.Type: GrantFiled: January 21, 2020Date of Patent: May 3, 2022Assignee: KONICA MINOLTA, INC.Inventors: Yuya Kubo, Kazuhiko Nakajima
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Publication number: 20220011687Abstract: The toner for developing an electrostatic charge image of the present invention contains a toner base particle comprising a binder resin and at least two kinds of organic pigments, and alumina as an external additive. The at least two kinds of organic pigments comprises: a pigment P1 having an absorption maximum wavelength ?max (nm) of greater than 400 nm and less than 600 nm when dispersed in methyl ethyl ketone; and a pigment P2 having an absorption maximum wavelength ? max (nm) of 600 nm or more and 700 nm or less when dispersed in methyl ethyl ketone.Type: ApplicationFiled: July 9, 2021Publication date: January 13, 2022Inventors: Shiro HIRANO, Takanari KAYAMORI, Yuya KUBO
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Publication number: 20220011686Abstract: The toner for developing an electrostatic charge image of the present invention contains a toner base particle comprising a binder resin and at least two kinds of organic pigments, and strontium titanate as an external additive.Type: ApplicationFiled: July 9, 2021Publication date: January 13, 2022Inventors: Takanari KAYAMORI, Yuya KUBO, Shiro HIRANO
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Publication number: 20220011685Abstract: The toner for developing an electrostatic charge image of the present invention contains a toner base particle comprising a binder resin, at least two kinds of organic pigments and carbon black, and strontium titanate as an external additive.Type: ApplicationFiled: July 9, 2021Publication date: January 13, 2022Inventors: Yuya KUBO, Takanari KAYAMORI, Noboru UEDA
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Publication number: 20200285169Abstract: An image forming method includes forming an image by transferring and fixing white toner and color toner of at least one color to a recording medium, wherein when an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the white toner are Tmw (° C.) and Tspw (° C.), respectively, and an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the color toner are Tmc (° C.) and Tspc (° C.), respectively, Equations (1) and (2) below are satisfied: [Math.Type: ApplicationFiled: January 21, 2020Publication date: September 10, 2020Inventors: Yuya Kubo, Kazuhiko Nakajima
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Patent number: 10534121Abstract: The present invention provides a means for suppressing an occurrence of a ghost by enhancing diffraction efficiency of a holographic optical element having a volume hologram recording layer. The present invention is a holographic optical element including: a volume hologram recording layer containing a photopolymer; and at least one adjacent layer which is in contact with the volume hologram recording layer and contains a resin, wherein a diffraction grating is formed so as to extend from the volume hologram recording layer to the adjacent layer.Type: GrantFiled: July 12, 2016Date of Patent: January 14, 2020Assignee: KONICA MINOLTA, INC.Inventors: Saburou Hiraoka, Kenichi Onaka, Daisuke Watanabe, Yuya Kubo, Kishio Tamura
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Publication number: 20180217311Abstract: The present invention provides a means for suppressing an occurrence of a ghost by enhancing diffraction efficiency of a holographic optical element having a volume hologram recording layer. The present invention is a holographic optical element including: a volume hologram recording layer containing a photopolymer, and at least one adjacent layer which is in contact with the volume hologram recording layer and contains a resin, wherein a diffraction grating is formed so as to extend from the volume hologram recording layer to the adjacent layer.Type: ApplicationFiled: July 12, 2016Publication date: August 2, 2018Inventors: SABUROU HIRAOKA, KENICHI ONAKA, DAISUKE WATANABE, YUYA KUBO, KISHIO TAMURA
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Publication number: 20180217312Abstract: The present invention relates to a holographic optical element having a volume hologram recording layer containing a photopolymer, and at least one adjacent layer that is in contact with the volume hologram recording layer and contains a resin and a thiol compound. According to the present invention, a means for improving the diffraction efficiency of a holographic optical element having a volume hologram recording layer is provided.Type: ApplicationFiled: July 12, 2016Publication date: August 2, 2018Inventors: Saburou HIRAOKA, Kenichi ONAKA, Daisuke WATANABE, Yuya KUBO, Kishio TAMURA
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Publication number: 20150220015Abstract: A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The coloring agent contains nigrosine and a pigment derivative, and preferably further contains carbon black. Preferably, Wn and Ws satisfy relation of 0.15?Ws/Wn?0.80, where Wn represents a ratio of content (mass %) of nigrosine in the toner particles and Ws represents a ratio of content (mass %) of the pigment derivative in the toner particles.Type: ApplicationFiled: January 29, 2015Publication date: August 6, 2015Applicant: KONICA MINOLTA, INC.Inventors: Yuya KUBO, Chiaki YAMADA, Masahiro ANNO, Kazuyoshi GOAN
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Patent number: 8974996Abstract: A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ?-caprolactone.Type: GrantFiled: November 1, 2012Date of Patent: March 10, 2015Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naoki Yoshie, Kenji Hayashi, Chiaki Yamada, Keiko Momotani, Masahiro Anno, Yuya Kubo, Miyuki Hotta
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Patent number: 8617782Abstract: A liquid developer includes at least toner particles and an insulating liquid. The toner particles include a resin and a color material dispersed in the resin. 90 mass % or more of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 16, and 20 to 60 mass % of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 12.Type: GrantFiled: August 14, 2012Date of Patent: December 31, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Keiko Momotani, Yuya Kubo, Masahiro Anno, Naoki Yoshie, Kenji Hayashi, Chiaki Yamada, Miyuki Hotta
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Publication number: 20130115552Abstract: A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ?-caprolactone.Type: ApplicationFiled: November 1, 2012Publication date: May 9, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naoki YOSHIE, Kenji HAYASHI, Chiaki YAMADA, Keiko MOMOTANI, Masahiro ANNO, Yuya KUBO, Miyuki HOTTA
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Publication number: 20130065176Abstract: A liquid developer includes at least toner particles and an insulating liquid. The toner particles include a resin and a color material dispersed in the resin. 90 mass % or more of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 16, and 20 to 60 mass % of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 12.Type: ApplicationFiled: August 14, 2012Publication date: March 14, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Keiko MOMOTANI, Yuya KUBO, Masahiro ANNO, Naoki YOSHIE, Kenji HAYASHI, Chiaki YAMADA, Miyuki HOTTA
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Publication number: 20120315577Abstract: A liquid developer includes toner particles, an insulating liquid, and a dispersant, and is characterized in that the toner particles includes a resin and a pigment dispersed in the resin, the resin includes a polyester resin, the dispersant includes a basic polymeric dispersant, and a solid obtained by drying the liquid developer has a melting point of at least 55° C.Type: ApplicationFiled: June 5, 2012Publication date: December 13, 2012Applicant: KONICA MINOLTA HOLDINGS, INC.Inventors: Miyuki MORIGUCHI, Masahiro ANNO, Naoki YOSHIE, Chiaki YAMADA, Keiko MOMOTANI, Kenji HAYASHI, Yuya KUBO
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Patent number: D1023074Type: GrantFiled: June 28, 2022Date of Patent: April 16, 2024Assignee: KUBOTA CORPORATIONInventors: Taiki Furuki, Ryo Masuda, Yuya Kusaka, Ryohei Sumiyoshi, Junichi Murakami, Takahiro Kubo