Patents by Inventor Shiro Hirano
Shiro Hirano 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: 8163451Abstract: An electrostatic latent image developing toner comprising at least a resin, a wax and a colorant, wherein the wax comprises 40 to 98% by mass of a first release agent comprising an ester wax and 2 to 60% by mass of a second release agent comprising a hydrocarbon having at least one of a branched chain structure and a cyclic structure; and the colorant comprises a silicon phthalocyanine represented by Formula (I):Type: GrantFiled: May 19, 2009Date of Patent: April 24, 2012Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naohiro Hirose, Meizo Shirose, Hiroyuki Yasukawa, Shiro Hirano, Tatsuya Fujisaki
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Publication number: 20110008071Abstract: Provided is a full color image forming method wherein high color reproducibility especially on a blue system and a green system can be obtained and an excellent gradation property can be obtained in a full color image to be obtained. The full color image forming method for forming a full color image by using at least yellow toner, magenta toner, and two kinds of cyan toners (1, 2) is characterized in that a toner image formed by the cyan toner (1) alone has the value of the maximum color saturation (C*) of not less than 50 and the value of lightness (L*) in a color space represented by an L*a*b* colorimetric system of not less than 30 and not more than 52, and that a toner image formed by the cyan toner (2) alone has the value of the maximum color saturation (C*) of not less than 50 and the value of the lightness (L*) in the color space represented by the L*a*b* calorimetric system of not less than 58 and not more than 75.Type: ApplicationFiled: July 13, 2009Publication date: January 13, 2011Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shiro Hirano, Naohiro Hirose, Kaori Soeda, Miyuki Murakami, Youhei Ohno
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Publication number: 20100330491Abstract: Provided is an electrostatic charge image developing toner producing neither halftone image unevenness nor density drop of solid images, even though a large number of print sheets are printed at high temperature and high humidity, and subsequently printing is further carried out at high temperature and high humidity after standing for a long time. Disclosed is an electrostatic charge image developing toner containing 3-10% by weight of at least one metal fluoride selected from the group consisting of sodium fluoride, magnesium fluoride, calcium fluoride, barium fluoride and aluminum fluoride, based on a total weight of the toner.Type: ApplicationFiled: June 16, 2010Publication date: December 30, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Kouji SUGAMA, Masahiko NAKAMURA, Masahiro ANNO, Shiro HIRANO, Junya ONISHI, Tatsuya FUJISAKI
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Patent number: 7799499Abstract: A method of forming an image comprising: (a) developing an electrostatic latent image formed on an electrophotographic photoreceptor with an electrophotographic toner so as to obtain a toner image; (b) transferring the toner image on the electrophotographic photoreceptor to a recording paper; and (c) fixing the transferred toner image with a fixing device comprising a belt fixing member having an endless belt, wherein the electrophotographic toner comprises a polymer having a glass transition point of 20 to 40° C.; an interfacial adhesion force (Fr) between the electrophotographic toner and poly(tetrafluoroethylene) is 1 to 3.5 N; and the fixing device comprises a heating roller which is provided at a position apart from a fixing nip area.Type: GrantFiled: July 17, 2007Date of Patent: September 21, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Takao Yamanouchi, Shingo Fujimoto, Shiro Hirano, Junya Onishi
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Publication number: 20100159383Abstract: The method for manufacturing a color print by an electrophotographic image forming process employs forming toner images by non-contact developing electrostatic latent images on electrostatic latent image holding members in developing devices. For each color, cyan, magenta and yellow, there is a separate electrostatic latent image, a separate electrostatic latent image holding member and a separate developing device. In each developing device the holding member is arranged in a non-contact position with respect to the electrostatic latent image holding member at a development portion. The non-contact developing is carried out by flying the toner from the toner holding member to the electrostatic latent image holding member. The cyan toner exhibits a maximum chroma at lightness L*C of from 53-70.Type: ApplicationFiled: December 17, 2009Publication date: June 24, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shinya OBARA, Shiro HIRANO, Natsuko KUSAKA, Hidehito HARUKI
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Patent number: 7741000Abstract: Disclosed is a method for forming color image, in which one of the yellow, magenta, cyan and black toners is a high water content toner, and one of the yellow, magenta, cyan and black toners is a toner low water content toner, water content of the high water content toner is 1.2 to 2.5% by weight based on the high water content toner, and water content of the low water content toner is 0.1 to 1.2% by weight based on the low water content toner.Type: GrantFiled: August 19, 2004Date of Patent: June 22, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Tatsuya Nagase, Meizo Shirose, Naohiro Hirose, Asao Matsushima, Yoshiyasu Matsumoto, Shiro Hirano
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Patent number: 7727697Abstract: An electrophotographic toner is disclosed, meeting the requirement that a ratio of a storage modulus at 60° C. [G?(60)] to a storage modulus at 80° C. [G?(80)], G?(60)/G?(80) is from 1×102 to 1×104; a ratio of a storage modulus at 100° C. [G?(100)] to a storage modulus at 120° C. [G?(120)], G?(100)/G?(120) is from 1 to 10; and a storage modulus at a temperature of from 140 to 160° C., [G?(140-160)] is not less than 102 dyn/cm2.Type: GrantFiled: July 17, 2007Date of Patent: June 1, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shiro Hirano, Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Junya Onishi
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Patent number: 7727695Abstract: An electrophotographic toner is disclosed, comprising a binding resin, a colorant and a releasing agent, wherein the releasing agent comprises a first releasing agent component and a second releasing agent component, the first releasing agent component is a straight chain hydrocarbon compound exhibiting a melting point of 50 to 100° C. and the second releasing agent component is a branched hydrocarbon compound exhibiting a melting point of 50 to 100° C., and the second releasing agent component accounting for 5% to 90% by mass of the total amount of the first and second releasing agent components.Type: GrantFiled: January 23, 2007Date of Patent: June 1, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shiro Hirano, Yoshiyasu Matsumoto, Masaaki Kondo, Junya Onishi, Aya Shirai
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Patent number: 7682766Abstract: In an image forming method in which a toner image, which is visualized via an electrostatic latent image formed on an electrophotographic photoreceptor, employing a developer incorporating toner, is transferred onto a recording material followed by fixing, and any residual toner remaining on the electrophotographic photoreceptor is removed, an image forming method in which an electrophotographic photoreceptor and a toner which satisfy specified requirements are employed and image formation is carried out while feeding a surface energy lowering agent from the developer onto the aforesaid electrophotographic photoreceptor, and an image forming apparatus employing the same.Type: GrantFiled: April 18, 2007Date of Patent: March 23, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Shiro Hirano, Junya Onishi
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Publication number: 20090291376Abstract: Disclosed is a full-color image forming method by which an image exhibiting comfortable image quality reliably suitable for a human visual system can be obtained in such a way that a halftone image exhibiting excellent granularity and evenness thereof is acquired.Type: ApplicationFiled: May 1, 2009Publication date: November 26, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shiro HIRANO, Mikio KOUYAMA, Kenji HAYASHI, Hiroyuki YASUKAWA
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Publication number: 20090291382Abstract: An electrostatic latent image developing toner comprising at least a resin, a wax and a colorant, wherein the wax comprises 40 to 98% by mass of a first release agent comprising an ester wax and 2 to 60% by mass of a second release agent comprising a hydrocarbon having at least one of a branched chain structure and a cyclic structure; and the colorant comprises a silicon phthalocyanine represented by Formula (I):Type: ApplicationFiled: May 19, 2009Publication date: November 26, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naohiro HIROSE, Meizo SHIROSE, Hiroyuki YASUKAWA, Shiro HIRANO, Tatsuya FUJISAKI
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Publication number: 20090291377Abstract: A set of toners comprising a yellow toner, a magenta toner, a cyan toner and a black toner for forming a full color image with an electrophotographic method, wherein the yellow toner comprises toner particles containing at least one pigment selected from the group consisting of C. I. Pigment Yellow 74, C. I. Pigment Yellow 139, C. I. Pigment Yellow 155, C. I. Pigment Yellow 180 and C. I.Type: ApplicationFiled: May 20, 2009Publication date: November 26, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naohiro HIROSE, Meizo Shirose, Kaori Soeda, Shiro Hirano, Shinya Obara
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Patent number: 7517628Abstract: Disclosed is a toner having a core/shell structure and including a hydrophilic resin and a hydrophobic resin, and a manufacturing method thereof.Type: GrantFiled: February 16, 2006Date of Patent: April 14, 2009Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shiro Hirano, Shingo Fujimoto, Takao Yamanouchi, Junya Onishi
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Publication number: 20080050156Abstract: A method of forming an image comprising: (a) developing an electrostatic latent image formed on an electrophotographic photoreceptor with an electrophotographic toner so as to obtain a toner image; (b) transferring the toner image on the electrophotographic photoreceptor to a recording paper; and (c) fixing the transferred toner image with a fixing device comprising a belt fixing member having an endless belt, wherein the electrophotographic toner comprises a polymer having a glass transition point of 20 to 40° C.; an interfacial adhesion force (Fr) between the electrophotographic toner and poly(tetrafluoroethylene) is 1 to 3.5 N; and the fixing device comprises a heating roller which is provided at a position apart from a fixing nip area.Type: ApplicationFiled: July 17, 2007Publication date: February 28, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Takao Yamanouchi, Shingo Fujimoto, Shiro Hirano, Junya Onishi
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Publication number: 20080038654Abstract: An electrophotographic developer comprising a toner and a carrier is disclosed. The contains a toner binder resin, a colorant and a releasing agent, and a carrier contains magnetic particles dispersed in a carrier binder resin, wherein the releasing agent contains a first releasing agent component of a linear-chain hydrocarbon compound having a melting point of from 50 to 100° C. in a ratio of from 10 to 95% by weight and a second releasing agent component comprising a branched-chain structure hydrocarbon compound having a melting point of from 50 to 100° C. in a ratio of from 5 to 90% by weight, and the carrier has a shape coefficient SF-1 of from 1.0 to 1.2, a shape-coefficient SF-2 of from 1.1 to 2.5 and a volume based median diameter of from 10 to 100 ?m.Type: ApplicationFiled: July 18, 2007Publication date: February 14, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Hiroshi YAMAZAKI, Ken OHMURA, Yoshiyasu MATSUMOTO, Shiro HIRANO
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Publication number: 20080020316Abstract: An electrophotographic toner is disclosed, meeting the requirement that a ratio of a storage modulus at 60° C. [G?(60)] to a storage modulus at 80° C. [G?(80)], G?(60)/G?(80) is from 1×102 to 1×104; a ratio of a storage modulus at 100° C. [G?(100)] to a storage modulus at 120° C. [G?(120)], G?(100)/G?(120) is from 1 to 10; and a storage modulus at a temperature of from 140 to 160° C., [G?(140-160)] is not less than 102 dyn/cm2.Type: ApplicationFiled: July 17, 2007Publication date: January 24, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shiro HIRANO, Shingo FUJIMOTO, Takao YAMANOUCHI, Hirofumi KOGA, Masaaki KONDO, Junya ONISHI
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Publication number: 20070254233Abstract: In an image forming method in which a toner image, which is visualized via an electrostatic latent image formed on an electrophotographic photoreceptor, employing a developer incorporating toner, is transferred onto a recording material followed by fixing, and any residual toner remaining on the electrophotographic photoreceptor is removed, an image forming method in which an electrophotographic photoreceptor and a toner which satisfy specified requirements are employed and image formation is carried out while feeding a surface energy lowering agent from the developer onto the aforesaid electrophotographic photoreceptor, and an image forming apparatus employing the same.Type: ApplicationFiled: April 18, 2007Publication date: November 1, 2007Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shingo FUJIMOTO, Takao YAMANOUCHI, Hirofumi KOGA, Masaaki KONDO, Shiro HIRANO, Junya ONISHI
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Patent number: 7276319Abstract: A toner for electrostatic latent image development includes a coloring agent and a resin wherein the toner is formed by a polymerization method and a content of aromatic amine contained in the toner is 50 ppm or less, and a volume average particle size of the toner is 3 to 8 ?m; and an image forming method employs the same toner.Type: GrantFiled: March 11, 2004Date of Patent: October 2, 2007Assignee: Konica Minolta Holdings, Inc.Inventors: Naohiro Hirose, Asao Matsushima, Shiro Hirano, Hiroshi Yamazaki
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Patent number: 7270923Abstract: An image forming method for forming a full color toner image by overlaying four color electrostatic image developing toners of black, yellow, magenta and cyan, wherein at least one of the four color electrostatic image developing toners is a toner containing a large diameter external additive in a larger amount and at least one is a toner containing the large diameter external additive in a smaller amount, in which the primary particle diameter of the large diameter external additive is from 150 nm to 2,000 nm, the content of the large diameter external additive in the toner containing the large diameter external additive in larger amount is from 0.06% by weight to 4.0% by weight and the content of the large diameter external additive in the toner containing the large diameter external additive in the smaller amount is not more than 0.05% by weight.Type: GrantFiled: August 24, 2004Date of Patent: September 18, 2007Assignee: Konica Minolta Business Technologies, Inc.Inventors: Yoshiyasu Matsumoto, Meizo Shirose, Naohiro Hirose, Tatsuya Nagase, Asao Matsushima, Shiro Hirano
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Publication number: 20070184374Abstract: An electrophotographic toner is disclosed, comprising a binding resin, a colorant and a releasing agent, wherein the releasing agent comprises a first releasing agent component and a second releasing agent component, the first releasing agent component is a straight chain hydrocarbon compound exhibiting a melting point of 50 to 100° C. and the second releasing agent component is a branched hydrocarbon compound exhibiting a melting point of 50 to 100° C., and the second releasing agent component accounting for 5% to 90% by mass of the total amount of the first and second releasing agent components.Type: ApplicationFiled: January 23, 2007Publication date: August 9, 2007Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shiro HIRANO, Yoshiyasu MATSUMOTO, Masaaki KONDO, Junya ONISHI, Aya SHIRAI