Patents by Inventor Kotaro Sumitomo
Kotaro Sumitomo 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: 8431632Abstract: The invention provides a crayon which comprises an alternative plasticizer in place of the conventional phthalate ester plasticizers and yet provides writings excellent in water resistance, the crayon comprising a colorant, a gelling agent, an organic solvent, a resin component, and a plasticizer, wherein the plasticizer is at least one selected from diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, and alkylsulfonic acid phenyl ester and is contained in an amount of 1 to 20% by weight based on the crayon.Type: GrantFiled: July 9, 2008Date of Patent: April 30, 2013Assignee: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 8299143Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component and carbon black having a pH of not less than 5.0 in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: GrantFiled: August 29, 2007Date of Patent: October 30, 2012Assignee: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 8242190Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component, carbon black having a pH of less than 5.0 and an organic amine in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: GrantFiled: August 29, 2007Date of Patent: August 14, 2012Assignee: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 7943684Abstract: The invention provides a process for producing a crayon without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises dissolving and dispersing carbon black and a resin component in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating, pouring the obtained raw material solution into a molding container, and then cooling and solidifying the solution, wherein carbon black having an average particle diameter of primary particles of 20 to 100 nm is used as the carbon black.Type: GrantFiled: July 9, 2007Date of Patent: May 17, 2011Assignee: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20100273914Abstract: The invention provides a crayon which comprises an alternative plasticizer in place of the conventional phthalate ester plasticizers and yet provides writings excellent in water resistance, the crayon comprising a colorant, a gelling agent, an organic solvent, a resin component, and a plasticizer, wherein the plasticizer is at least one selected from diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, and alkylsulfonic acid phenyl ester and is contained in an amount of 1 to 20% by weight based on the crayon.Type: ApplicationFiled: July 9, 2008Publication date: October 28, 2010Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20100016471Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component, carbon black having a pH of less than 5.0 and an organic amine in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: ApplicationFiled: August 29, 2007Publication date: January 21, 2010Applicant: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20090326096Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component and carbon black having a pH of not less than 5.0 in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: ApplicationFiled: August 29, 2007Publication date: December 31, 2009Applicant: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20090247668Abstract: The invention provides a process for producing a crayon without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises dissolving and dispersing carbon black and a resin component in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating, pouring the obtained raw material solution into a molding container, and then cooling and solidifying the solution, wherein carbon black having an average particle diameter of primary particles of 20 to 100 nm is used as the carbon black.Type: ApplicationFiled: July 9, 2007Publication date: October 1, 2009Inventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20090209678Abstract: The invention provides a crayon having excellent feel when writing while having high gel hardness. The crayon comprises a colorant, a gelling agent, an organic solvent and a resin component, wherein the gelling agent is at least one selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof, and the resin component comprises a combination of polyvinyl butyral resin having an average degree of polymerization of less than 350 and polyvinyl butyral resin having an average degree of polymerization of 350 or more.Type: ApplicationFiled: July 9, 2007Publication date: August 20, 2009Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 7485406Abstract: The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols.Type: GrantFiled: April 7, 2006Date of Patent: February 3, 2009Assignee: Sakura Color Products CorporationInventors: Hidetoshi Fukuo, Masamitsu Takahashi, Kotaro Sumitomo
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Patent number: 7291210Abstract: Disclosed herein is a first solid drawing material comprising water, a coloring agent, a solidifying agent that is a fatty acid alkali metal salt, and an O/W type emulsion of a separating agent that is an oily material which hardly volatilizes at room temperature. The first solid drawing material preferably contains silicone oil. A second solid drawing material is also disclosed, which comprises an organic solvent, a coloring agent, a solidifying agent that is at least one selected from the group consisting of dibenzylidene sorbitol, tribenylidene sorbitol, and derivatives thereof, a separating agent that is an oily material which hardly volatilizes at room temperature, and a resin soluble in the organic solvent. In these solid drawing materials, the separating agent is evenly dispersed, and therefore they have stable drawing properties and erasability.Type: GrantFiled: January 28, 2005Date of Patent: November 6, 2007Assignee: Sakura Color Products CorporationInventors: Keiko Nakamura, Kotaro Sumitomo, Hidetoshi Fukuo
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Publication number: 20060210924Abstract: The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols.Type: ApplicationFiled: April 7, 2006Publication date: September 21, 2006Inventors: Hidetoshi Fukuo, Masamitsu Takahashi, Kotaro Sumitomo
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Publication number: 20050252409Abstract: Disclosed herein is a first solid drawing material comprising water, a coloring agent, a solidifying agent that is a fatty acid alkali metal salt, and an O/W type emulsion of a separating agent that is an oily material which hardly volatilizes at room temperature. The first solid drawing material preferably contains silicone oil. A second solid drawing material is also disclosed, which comprises an organic solvent, a coloring agent, a solidifying agent that is at least one selected from the group consisting of dibenzylidene sorbitol, tribenylidene sorbitol, and derivatives thereof, a separating agent that is an oily material which hardly volatilizes at room temperature, and a resin soluble in the organic solvent. In these solid drawing materials, the separating agent is evenly dispersed, and therefore they have stable drawing properties and erasability.Type: ApplicationFiled: January 28, 2005Publication date: November 17, 2005Inventors: Keiko Nakamura, Kotaro Sumitomo, Hidetoshi Fukuo
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Publication number: 20050197423Abstract: The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a fluorescent substance represented by the general formula MO.Al2SiO8 wherein M is at least one metal element selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols.Type: ApplicationFiled: November 4, 2004Publication date: September 8, 2005Inventors: Hidetoshi Fukuo, Masamitsu Takahashi, Kotaro Sumitomo