Patents by Inventor Takeshi Omatsu

Takeshi Omatsu 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).

  • Patent number: 8123845
    Abstract: The invention provides a dual color ink composition which comprises: (a) at least one pigment selected from a pearlescent pigment and a metal powder pigment; (b) water; (c) at least one water-soluble organic solvent selected from alcohols, glycols and glycol ethers, any of which have a branched hydrophobic group; (d) a water-soluble dye; and (e) a modified starch as a water-soluble fixing agent.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: February 28, 2012
    Assignee: Sakura Color Products Corporation
    Inventors: Takeshi Omatsu, Tomochika Yoshitsugi
  • Patent number: 8080098
    Abstract: In a water-based ink composition of the present invention, 2.5 to 50 wt % of white-colored resin particles and 2.5 to 50 wt % of film-forming resin emulsions in a solid content are contained with respect to the total amount of the ink, the ratio of said white-colored resin particles to film-forming resin emulsions is 1:0.2 to 1:3, and not less than 20 wt % of said white-colored resin particles and film-forming resin emulsions in a solid content are contained in total.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: December 20, 2011
    Assignee: Sakura Color Products Corporation
    Inventors: Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita, Hiroshi Inoue, Takeshi Omatsu, Shigeki Yoneda, Tomohiro Sawa
  • Patent number: 7914222
    Abstract: A tip unit (1) incorporated in a liquid applicator such as a ball-point pen, the tip unit being capable of an increased rate of liquid discharge with no leaking or clogging problem. To achieve it, the tip unit (1) is accommodated in a tip body (11) having a ball housing (15), a ball (10), a capillary hole (16), and a proximal bore, the ball housing (15) being a passage for allowing liquid to flow therethrough, the ball (10) being rotatively held in the ball housing (15). The ball housing (15) is provided with at least one ink channel (47) adapted to communicate the ball housing (15) with the capillary hole (16) or the proximal bore. The ball housing (15) has a ball resting seat (45) and a side wall (41) that are connected by a connecting surface (71) having a shape of a truncated conical surface with its apex toward the distal end of the tip unit (1).
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: March 29, 2011
    Assignee: Sakura Color Products Corporation
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Patent number: 7905671
    Abstract: The ink backflow preventive of the present invention contains at least refractory and/or involatile organic liquid substances and gelling agents, wherein the oil separation degree under the specific condition is prepared to be 1 to 15 %, in which as at least said gelling agents, styrene-based thermoplastic elastomer is contained and said styrene-based thermoplastic elastomer is composed of two or more of said styrene-based thermoplastic elastomer with the same molecular weight and with the different average molecular weight.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: March 15, 2011
    Assignee: Sakura Color Products Corporation
    Inventors: Takeshi Omatsu, Hirokazu Matsuda, Hiroshi Inoue
  • Patent number: 7776941
    Abstract: An oil-based ink composition for writing instruments is provided that is capable of improving storage stability of an ink, while maintaining a leveling property even when a soluble gelling agent is used. The oil-based ink composition for writing instruments comprises a colorant, a resin, an organic solvent and a gelling agent, wherein said organic solvent(s) is (are) hydrocarbons solvent(s), and in particular, at least one species of the solvent selected from the group of aliphatic hydrocarbons solvent(s), alicyclic hydrocarbons solvent(s), aromatic hydrocarbons solvent(s), and halogenetad hydrocarbons solvent(s), said gelling agent(s) comprises (comprise) soluble gelling agent(s) soluble to the above organic solvent(s) and insoluble gelling agent(s) insoluble to the above organic solvent(s), and the above insoluble gelling agent(s) is (are) urea-modified thixotropic agent(s).
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: August 17, 2010
    Assignee: Sakura Color Products Corporation
    Inventors: Shigeki Yoneda, Takeshi Omatsu
  • Publication number: 20100162921
    Abstract: The invention provides a dual color ink composition which comprises: (a) at least one pigment selected from a pearlescent pigment and a metal powder pigment; (b) water; (c) at least one water-soluble organic solvent selected from alcohols, glycols and glycol ethers, any of which have a branched hydrophobic group; (d) a water-soluble dye; and (e) a modified starch as a water-soluble fixing agent.
    Type: Application
    Filed: June 11, 2007
    Publication date: July 1, 2010
    Inventors: Takeshi Omatsu, Tomochika Yoshitsugi
  • Patent number: 7721402
    Abstract: A method for producing a tip unit for a liquid applicator including: a first process of shaping the contour of a tip body in the form of a truncated conical surface; a second process of forming a ball housing having an open end at its distal end in the tip body; a third process of placing a ball into the ball housing; a fourth process of scraping the peripheral side of the distal end portion of the tip body to form a peripherally scraped portion after the first process; and a fifth process of deforming the peripherally scraped distal end portion of the tip body toward the ball.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: May 25, 2010
    Assignee: Sakura Color Products Corporation
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Patent number: 7637680
    Abstract: A coating tool that includes an ink containment tube, an oily ink and a backflow inhibiting material. The ink is in contact with the inhibiting material. The ink containment tube has a boundary which is in contact with the oily ink and the backflow inhibiting material. The boundary contains polyvinyl alcohol and fluorine-based surfactants, the oily ink contains a colorant, a resin, an organic solvent, and a gelling agent, and the backflow inhibiting material consists of base material components and a gelling agent which contains polyacrylic acid, the polyacrylic acid being present in an amount of 0.1 to 3 wt % with respect to the total amount of said backflow inhibiting material.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: December 29, 2009
    Assignee: Sakura Color Products Corporation
    Inventors: Shigeki Yoneda, Takeshi Omatsu
  • Publication number: 20090234069
    Abstract: An oil-based ink composition for writing instruments is provided that is capable of improving storage stability of an ink, while maintaining a leveling property even when a soluble gelling agent is used. The oil-based ink composition for writing instruments comprises a colorant, a resin, an organic solvent and a gelling agent, wherein said organic solvent(s) is (are) hydrocarbons solvent(s), and in particular, at least one species of the solvent selected from the group of aliphatic hydrocarbons solvent(s), alicyclic hydrocarbons solvent(s), aromatic hydrocarbons solvent(s), and halogenetad hydrocarbons solvent(s), said gelling agent(s) comprises (comprise) soluble gelling agent(s) soluble to the above organic solvent(s) and insoluble gelling agent(s) insoluble to the above organic solvent(s), and the above insoluble gelling agent(s) is (are) urea-modified thixotropic agent(s).
    Type: Application
    Filed: May 23, 2006
    Publication date: September 17, 2009
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Shigeki P. Yoneda, Takeshi Omatsu
  • Patent number: 7541394
    Abstract: A water base pigment ink composition for inner lead type writing instruments do not comprise white colored inorganic pigments or white colored resin particles as coloring materials and the content of pigment is 0.5 to 7 wt %, the content of water-soluble resin is 2 to 10 wt % with respect to the total amount of the ink, and the viscosity is 3.5 to 10 mPa·s.
    Type: Grant
    Filed: December 26, 2003
    Date of Patent: June 2, 2009
    Assignee: Sakura Color Products Corporation
    Inventors: Kazuhiro Kawauchi, Takeshi Omatsu
  • Patent number: 7538148
    Abstract: The ink of the present invention comprises at least a three-dimensional film-forming component and water, comprises an adhesive synthetic resin emulsion as said three-dimensional film-forming component, and comprises at least 30% by weight of said adhesive synthetic resin emulsion on the basis of the solid content with respect to the total amount of the ink, and minimum film-forming temperature (MFT) of said adhesive synthetic resin emulsion is not greater than 25° C. and further, said ink comprises 1 to 3% by weight of a film-forming assistant with respect to the total amount of the ink.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: May 26, 2009
    Assignee: Sakura Color Products Corporation
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Publication number: 20070237569
    Abstract: The ink backflow preventive of the present invention contains at least refractory and/or involatile organic liquid substances and gelling agents, wherein the oil separation degree under the specific condition is prepared to be 1 to 15 %, in which as at least said gelling agents, styrene-based thermoplastic elastomer is contained and said styrene-based thermoplastic elastomer is composed of two or more of said styrene-based thermoplastic elastomer with the same molecular weight and with the different average molecular weight.
    Type: Application
    Filed: June 30, 2005
    Publication date: October 11, 2007
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Takeshi Omatsu, Hirokazu Matsuda, Hiroshi Inoue
  • Publication number: 20070203259
    Abstract: In a water-based ink composition of the present invention, 2.5 to 50 wt % of white-colored resin particles and 2.5 to 50 wt % of film-forming resin emulsions in a solid content are contained with respect to the total amount of the ink, the ratio of said white-colored resin particles to film-forming resin emulsions is 1:0.2 to 1:3, and not less than 20 wt % of said white-colored resin particles and film-forming resin emulsions in a solid content are contained in total.
    Type: Application
    Filed: August 8, 2005
    Publication date: August 30, 2007
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita, Hiroshi Inoue, Takeshi Omatsu, Shigeki Yoneda, Tomohiro Sawa
  • Publication number: 20070110507
    Abstract: A tip unit (1) incorporated in a liquid applicator such as a ball-point pen, the tip unit being capable of an increased rate of liquid discharge with no leaking or clogging problem. To achieve it, the tip unit (1) is accommodated in a tip body (11) having a ball housing (15), a ball (10), a capillary hole (16), and a proximal bore, the ball housing (15) being a passage for allowing liquid to flow therethrough, the ball (10) being rotatively held in the ball housing (15). The ball housing (15) is provided with at least one ink channel (47) adapted to communicate the ball housing (15) with the capillary hole (16) or the proximal bore. The ball housing (15) has a ball resting seat (45) and a side wall (41) that are connected by a connecting surface (71) having a shape of a truncated conical surface with its apex toward the distal end of the tip unit (1).
    Type: Application
    Filed: May 26, 2004
    Publication date: May 17, 2007
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Publication number: 20070070165
    Abstract: The invention provides a coating tool in which an oily ink and a backflow inhibiting material contacting with said ink are contained, wherein the above mentioned ink containment tube has a boundary which contacts with said oily ink and said backflow inhibiting material, the above mentioned oily ink contains polyvinyl alcohol and fluorine-based surfactants said boundary contains polyvinyl alcohol and fluorine-based surfactants, said oily ink contains a colorant, a resin, an organic solvent, and a gelling agent, and at least an organic solvent among aliphatic hydrocarbon-based solvent or an alicyclic hydrocarbon-based solvent is contained as said organic solvent, and a metal soap is contained as said gelling agent, and said backflow inhibiting material consists of base material components and a gelling agent which contains polyacrylic acid, and the above mentioned plyacrylic acid is contained in 0.1 to 3 wt % with respect to the total amount of said backflow inhibiting material.
    Type: Application
    Filed: November 4, 2004
    Publication date: March 29, 2007
    Inventors: Shigeki Yoneda, Takeshi Omatsu
  • Publication number: 20060260112
    Abstract: A method for producing a tip unit (1) for a liquid applicator in a stable and easy process, the tip unit (1) being capable of increasing the rate of liquid discharge is provided. The method includes at least five processes; that is, a first process of shaping the contour of a tip body (11) in the form of a truncated conical surface; a second process of forming a ball housing (15) having an open end at its distal end in the tip body (11); a third process of placing a ball (10) into the ball housing (15); a fourth process of scraping the peripheral side of the distal end portion of the tip body (11) to form a peripherally scraped portion (55) after the first process; and a fifth process of deforming the peripherally scraped distal end portion of the tip body (11) toward the ball (10).
    Type: Application
    Filed: May 26, 2004
    Publication date: November 23, 2006
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Publication number: 20060233595
    Abstract: The ink of the present invention comprises at least a three-dimensional film-forming component and water, comprises an adhesive synthetic resin emulsion as said three-dimensional film-forming component, and comprises at least 30% by weight of said adhesive synthetic resin emulsion on the basis of the solid content with respect to the total amount of the ink, and minimum film-forming temperature (MFT) of said adhesive synthetic resin emulsion is not greater than 25° C. and further, said ink comprises 1 to 3% by weight of a film-forming assistant with respect to the total amount of the ink.
    Type: Application
    Filed: May 26, 2004
    Publication date: October 19, 2006
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
  • Publication number: 20060142418
    Abstract: A water base pigment ink composition for inner lead type writing instruments do not comprise white colored inorganic pigments or white colored resin particles as coloring materials and the content of pigment is 0.5 to 7 wt %, the content of water-soluble resin is 2 to 10 wt % with respect to the total amount of the ink, and the viscosity is 3.5 to 10 mPa·s.
    Type: Application
    Filed: December 26, 2003
    Publication date: June 29, 2006
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Kazuhiro Kawauchi, Takeshi Omatsu
  • Publication number: 20050234150
    Abstract: The invention provides a water based pigment ink composition comprising water, a pigment, a water-soluble resin, a phosphoric acid ester as a surfactant and an O/W type emulsion of at least one water-insoluble resin selected from the group consisting of acrylic resin, styrene resin and styrene/acrylic resin, wherein resin particles in the emulsion have an average particle diameter in the range of 50 to 200 nm, and the emulsion has a minimum film forming temperature of 50° C. or more. The water based pigment ink composition has excellent coloration in a common white paper and is excellent in the dispersion stability of a pigment and in storage stability, thus giving a handwriting at high density by use in a writing implement or an inkjet image at high density by use in an inkjet printer.
    Type: Application
    Filed: December 2, 2004
    Publication date: October 20, 2005
    Inventors: Takeshi Omatsu, Kazuhiro Kawauchi
  • Publication number: 20040229373
    Abstract: A method of measuring ozone concentration, comprising the steps of: preparing an ozone indicator comprising at least (1) a color-change layer comprised of an ozone sensitive ink and (2) an overcoat layer formed on part or the whole of the surface of the color-change layer; disposing the ozone indicator in an ozone atmosphere; and calculating a CT value from color difference or size of color-change zone resulting from color change of the color-change layer.
    Type: Application
    Filed: June 15, 2004
    Publication date: November 18, 2004
    Inventors: Takeshi Omatsu, Satoshi Maruyama