Patents by Inventor Hidefumi Nagashima

Hidefumi Nagashima 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: 20150368492
    Abstract: An ink contains a colorant, a water soluble organic solvent, a silicone-based surfactant, a compound represented by the following chemical formula 1, and water, wherein the water soluble organic solvent having a boiling point of 250° C. or higher accounts for 38% by weight or less in a total amount of the water soluble organic solvent, where R11 and R12 each, independently represent aliphatic hydrocarbon groups having 3 to 6 carbon atoms with forks and R13 and R14 each, independently represent alkyl groups having one to two carbon atoms, and n represents an integer of from 1 to 6.
    Type: Application
    Filed: June 5, 2015
    Publication date: December 24, 2015
    Inventors: Ichiroh FUJII, Naohiro TODA, Tomohiro NAKAGAWA, Hidefumi NAGASHIMA, Juichi FURUKAWA, Hikaru KOBAYASAHI
  • Publication number: 20150361282
    Abstract: An inkjet ink, containing: water; a water-soluble organic solvent; a pigment; and polycarbonate urethane resin particles, wherein the water-soluble organic solvent contains 50% by mass or more of a diol compound, and wherein the water-soluble organic solvent contains 50% by mass or more of a water-soluble organic solvent having a boiling point of 200° C. or less.
    Type: Application
    Filed: January 27, 2014
    Publication date: December 17, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiro NAKAGAWA, Naohiro TODA, Hidefumi NAGASHIMA, Ichiroh FUJII, Juichi FURUKAWA
  • Publication number: 20150329731
    Abstract: An ink for inkjet recording, including: water; a water-soluble organic solvent; a pigment; and resin particles, wherein 50% by mass or more of the water-soluble organic solvent is a water-soluble organic solvent having a boiling point of lower than 200° C., and the water-soluble organic solvent having a boiling point of lower than 200° C. comprises 3-methoxy-3-methyl-1-butanol.
    Type: Application
    Filed: January 27, 2014
    Publication date: November 19, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Ichiroh FUJII, Nachiro TODA, Tomohiro NAKAGAWA, Hidefumi NAGASHIMA
  • Patent number: 9163160
    Abstract: Aqueous ink for inkjet contains water; a hydrosoluble organic solvent; a pigment; and a resin, wherein the hydrosoluble organic solvent contains 2,3-butane diol having meso-2,3-butane diol in an amount of 50% by weight or more in 2,3-butane diol and 2,3-butane diol accounts for 5% by weight to 40% by weight of the entire of the aqueous ink.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: October 20, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naohiro Toda, Tomohiro Nakagawa, Hidefumi Nagashima, Juichi Furukawa, Ichiroh Fujii, Kiyofumi Nagai
  • Publication number: 20150258783
    Abstract: An inkjet recording method includes ejecting an ink having a temperature from 28° C. to 40° C. and attaching the ink to a non-porous substrate having a temperature 5° C. to 20° C. higher than that of the ink, wherein the ink contains a colorant, resin particles, water, a hydrosoluble organic solvent, and a silicone-based surfactant, wherein the silicone-based surfactant accounts for 1% by weight to 3% by weight in the ink.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 17, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Naohiro Toda, Hidefumi Nagashima, Tomohiro Nakagawa, Juichi Furukawa, Ichiroh Fujii
  • Publication number: 20150259553
    Abstract: An ink contains water, a hydrosoluble organic solvent, a colorant, a resin A; and a resin B, wherein the content of the resin B is from 0.5% by weight to less than 10% by weight to the content of the resin A and the resin B has a minimum film-forming temperature at least 30° C. lower than that of the resin A.
    Type: Application
    Filed: March 10, 2015
    Publication date: September 17, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiro NAKAGAWA, Naohiro Toda, Hidefumi Nagashima, Juichi Furukawa, Hikaru Kobayashi
  • Patent number: 9108439
    Abstract: A method of forming an image includes a step of heating a nonporous substrate to a temperature in a range of from 30° C. to 80° C.; and a step of forming an image on the nonporous substrate by applying water-based inks of at least two colors to the nonporous substrate employing an ink jet technique, wherein an ink set that contains water-based inks each containing a coloring material, an emulsion resin, water, and a water-soluble solvent is used to apply the water-based inks of the at least two colors, and, of the water-based inks in the ink set, at least one water-based ink has a minimum film-forming temperature different from those of water-based inks of other colors.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: August 18, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naohiro Toda, Hidefumi Nagashima, Tomohiro Nakagawa
  • Publication number: 20150191614
    Abstract: An aqueous ink for inkjet includes water, at least one hydrosoluble organic solvent each having a boiling point of 250° C. or lower; vinyl polymer particles containing a pigment, and polycarbonate-based urethane resin particles, wherein the aqueous ink for inkjet is used for an inkjet recording system including a heating step.
    Type: Application
    Filed: January 5, 2015
    Publication date: July 9, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hidefumi Nagashima, Naohiro Toda, Tomohiro Nakagawa, Juichi Furukawa, Ichiroh Fujii
  • Publication number: 20150165787
    Abstract: An inkjet recording method includes recording an image on a heated nonpermeable substrate with an aqueous ink by an inkjet method; and drying the aqueous ink, wherein the method satisfies the following requirements (1) to (3): (1) the aqueous ink comprises water, a hydrosoluble organic solvent, a pigment and a particulate resin, wherein the hydrosoluble organic solvent comprises a solvent having a boiling point not higher than 200° C. in an amount not less than 50% by weight; (2) the hydrosoluble organic solvent having a boiling point not higher than 200° C. comprises 3-methoxy-3-methyl-1-butanol; and (3) a difference of heating temperatures between the recording and the drying is from 25 to 80° C.
    Type: Application
    Filed: December 4, 2014
    Publication date: June 18, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ichiroh Fujii, Naohiro Toda, Tomohiro Nakagawa, Hidefumi Nagashima, Juichi Furukawa
  • Publication number: 20150138284
    Abstract: An inkjet ink including: water; a water-soluble organic solvent; a pigment; polycarbonate modified urethane resin particles; an ultraviolet absorber; and a light stabilizer.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 21, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hidefumi Nagashima, Naohiro Toda, Tomohiro Nakagawa, Juichi Furukawa, Ichiroh Fujii
  • Publication number: 20150116433
    Abstract: An aqueous ink for inkjet includes water; a hydrosoluble organic solvent; a pigment; and a particulate resin. The hydrosoluble organic solvent includes 2,3-butanediol and 1,2-propanediol at a weight ratio (2,3-butanediol/1,2-propanediol) of from 98/2 to 60/40.
    Type: Application
    Filed: October 3, 2014
    Publication date: April 30, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ichiroh Fujii, Naohiro TODA, Tomohiro NAKAGAWA, Hidefumi NAGASHIMA, Juichi FURUKAWA
  • Publication number: 20150077482
    Abstract: Aqueous ink for inkjet contains water; a hydrosoluble organic solvent; a pigment; and a resin, wherein the hydrosoluble organic solvent contains 2,3-butane diol having meso-2,3-butane diol in an amount of 50% by weight or more in 2,3-butane diol and 2,3-butane diol accounts for 5% by weight to 40% by weight of the entire of the aqueous ink.
    Type: Application
    Filed: September 10, 2014
    Publication date: March 19, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Naohiro Toda, Tomohiro Nakagawa, Hidefumi Nagashima, Juichi Furukawa, Ichiroh Fujii, Kiyofumi Nagai
  • Publication number: 20150077479
    Abstract: Aqueous ink for inkjet that contains water; a hydrosoluble organic solvent; a pigment; and a resin, wherein the hydrosoluble organic solvent comprises 2,3-butane diol having a total ratio of (2R, 3R) form and (2S, 3S) form of greater than 50% by weight in 2,3-butane diol, where (2R, 3R) form represents (2R, 3R)-(?)-2,3-butane diol and (2S, 3S) form represents (2S, 3S)-(+)-2,3-butane diol, wherein 2,3-butane diol accounts for 5% by weight to 40% by weight of the entire of the aqueous ink.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 19, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiro NAKAGAWA, Naohiro TODA, Hidefumi NAGASHIMA, Juichi FURUKAWA, Ichiroh FUJII
  • Publication number: 20150050467
    Abstract: Ink for aqueous inkjet recording contains water, a hydrosoluble organic solvent; a pigment; and an acrylic-modified polycarbonate-based urethane resin that contains at least one of an acrylic monomer, a methacrylic monomer, and an alkylester thereof as components.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 19, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiro Nakagawa, Naohiro Toda, Hidefumi Nagashima, Juichi Furukawa, Ichiroh Fujii
  • Publication number: 20150017396
    Abstract: An ink for aqueous inkjet recording contains: water; a hydrosoluble organic solvent; a pigment; and polycarbonate-based urethane resin particles, wherein the pigment contains a geminalbis phosphonic acid group and/or a geminalbis phosphonate group.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 15, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiro Nakagawa, Naohiro Toda, Hidefumi Nagashima, Ichiroh Fujii
  • Publication number: 20140377516
    Abstract: An aqueous ink for inkjet recording contains water, a hydrosoluble organic solvent, resin particles, and a pigment, wherein the hydrosoluble organic solvent contains at least three kinds of diol compounds accounting for 45% by weight or more in the hydrosoluble organic solvent, wherein three or more of the at least three kinds of diol compounds have boiling points 10° C. or greater apart from each other.
    Type: Application
    Filed: June 6, 2014
    Publication date: December 25, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Naohiro TODA, Tomohiro NAKAGAWA, Hidefumi NAGASHIMA, Ichiroh FUJII
  • Patent number: 8899719
    Abstract: An image forming method includes discharging an inkjet ink including a water-dispersible colorant, a wetter, a surfactant, a penetrant water-dispersible polyurethane resin having a median diameter of from 0.01 to 0.10 ?m water and at least one of a polyethylene wax and a paraffin wax on the surface of the recording medium on which the inkjet ink is discharged.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: December 2, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidefumi Nagashima, Michihiko Namba, Kiyofumi Nagai
  • Patent number: 8883275
    Abstract: A inkjet recording medium and ink set including ink containing water, a hydrosoluble organic solvent comprising an amide compound represented by the following Chemical Structure 1, a surface active agent; and a coloring agent, and a recording medium containing a substrate; and a coated layer on at least one side of the substrate, wherein the transfer amount of pure water to the recording medium having the coated layer is 2 ml/m2 to 35 ml/m2 during a contact time of 100 ms and 3 ml/m2 to 40 ml/m2 during a contact time of 400 ms when measured by a liquid dynamic absorption tester at 23° C.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: November 11, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidefumi Nagashima, Hiroshi Gotou
  • Publication number: 20140267520
    Abstract: A method of forming an image includes a step of heating a nonporous substrate to a temperature in a range of from 30° C. to 80° C.; and a step of forming an image on the nonporous substrate by applying water-based inks of at least two colors to the nonporous substrate employing an ink jet technique, wherein an ink set that contains water-based inks each containing a coloring material, an emulsion resin, water, and a water-soluble solvent is used to apply the water-based inks of the at least two colors, and, of the water-based inks in the ink set, at least one water-based ink has a minimum film-forming temperature different from those of water-based inks of other colors.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Naohiro Toda, Hidefumi Nagashima, Tomohiro Nakagawa
  • Publication number: 20140192112
    Abstract: An image forming method includes discharging an inkjet ink including a water-dispersible colorant, a wetter, a surfactant, a penetrant water-dispersible polyurethane resin having a median diameter of from 0.01 to 0.10 ?m water and at least one of a polyethylene wax and a paraffin wax on the surface of the recording medium on which the inkjet ink is discharged.
    Type: Application
    Filed: November 7, 2013
    Publication date: July 10, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hidefumi NAGASHIMA, Michihiko Namba, Kiyofumi Nagai