Patents by Inventor Yuusuke Koizuka

Yuusuke Koizuka 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: 11904600
    Abstract: A printing method includes discharging ink to a substrate, heating a non-ink-discharged side of the substrate at T1, and heating an ink-discharged side of the substrate at T2, wherein the ink contains an organic solvent A (boiling point lower than 250 degrees C.), an organic solvent B (boiling point of 250 degrees C.), and a resin, where 0 degrees C. C?T2?T1?90 degrees C. is satisfied, the proportion (organic solvent A/ink) is 30 percent by mass or less, the proportion (organic solvent B/ink) is 1 to 3 percent by mass, the proportion (resin/ink) is 5 to 15 percent by mass, the ink has a viscosity of 8.0 to 11.0 mPa-s at 25 degrees C. and 5.5 to 11.0 mPa-s at 36 degrees C., and a 2.5 ?L ink droplet discharged to the substrate shrinks to 0.1 ?L within 10.0 seconds at 25 degrees C.
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: February 20, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Naoto Shimura, Yuya Hirokawa, Yuusuke Koizuka, Takayuki Shimizu, Itsuro Sasaki, Shunsuke Horie, Nozomi Terai, Kenta Hagiwara
  • Patent number: 11851571
    Abstract: Provided is an ink set including standard ink and light ink. Standard ink includes cyan, magenta, and yellow inks. Light ink includes a light cyan or light magenta ink, or both. The pigment concentration in cyan ink is 1.9% by mass or greater but 3.6% by mass or less. The pigment concentration in light cyan ink is 0.4% by mass or greater but 1.4% by mass or less. The pigment concentration in magenta ink is 1.9% by mass or greater but 3.6% by mass or less. The pigment concentration in light magenta ink is 0.4% by mass or greater but 1.4% by mass or less. The light ink contains water, organic solvent, and resin. The organic solvent contains amide compound represented by General formula (1). In General formula (1), R1, R2, and R3 each represent a hydrocarbon group containing from 1 through 8 carbon atoms.
    Type: Grant
    Filed: September 23, 2021
    Date of Patent: December 26, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuusuke Koizuka, Naoto Shimura, Nozomi Terai, Tatsuya Takarada
  • Publication number: 20230303877
    Abstract: An ink set contains an ink containing a coloring material, an organic solvent, and a resin, and a pre-processing fluid containing a multivalent metal salt, a resin having a glass transition temperature (Tg) of 0 degrees C. or lower, a silicone-based surfactant, and two or more types of organic solvents each having a boiling point of 220 degrees C. or lower.
    Type: Application
    Filed: October 25, 2021
    Publication date: September 28, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Naoto Shimura, Yuusuke Koizuka, Nozomi Terai, Tatsuya Takarada
  • Publication number: 20230174811
    Abstract: A printing method prints an image on a leather with an ink set including a color ink and a clear ink. The printing method includes: applying the clear ink to a region of the leather where the color ink is to be applied; applying the color ink onto the clear ink applied; and applying the clear ink onto the color ink applied.
    Type: Application
    Filed: June 22, 2021
    Publication date: June 8, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Naoto SHIMURA, Yuusuke Koizuka
  • Patent number: 11660897
    Abstract: Printed matter includes a substrate comprising a vinyl chloride resin and a printing layer on the substrate, wherein the surface of the substrate has a static friction coefficient of from 0.04 to 0.06 and a dynamic friction coefficient of from 0.02 to 0.03 when the surface of the substrate is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g, wherein the surface of the printing layer has a static friction coefficient of from 0.35 to 0.50 and a dynamic friction coefficient of from 0.20 to 0.30 when the surface of the printing layer is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g.
    Type: Grant
    Filed: October 8, 2021
    Date of Patent: May 30, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Takarada, Yuusuke Koizuka, Naoto Shimura, Nozomi Terai, Takayuki Shimizu, Mio Akima
  • Publication number: 20230012907
    Abstract: An image forming method includes a processing fluid applying step and an ink applying step. The processing fluid applying step involves applying a processing fluid containing a multivalent metal salt, a resin TA, a resin TB different from the resin TA, and a silicone-based surfactant to a non-permeating base material by an inkjet method, where the processing fluid is free of an organic solvent having a boiling point of 200° C. or higher at normal pressure. The ink applying step involves applying an ink containing a coloring material, an organic solvent, and a resin onto the processing fluid.
    Type: Application
    Filed: July 1, 2022
    Publication date: January 19, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Tatsuya Takarada, Yuusuke Koizuka, Naoto Shimura, Nozomi Terai, Yuya Hirokawa
  • Publication number: 20220396708
    Abstract: A set of a processing fluid and an ink is provided where the ink contains a coloring material, an organic solvent, and a resin Ri and the processing fluid contains a polyvalent metal salt, a resin Rt, and a silicone-based surfactant. A maximum tensile stress of an ink film obtained by drying the ink is 2 N/mm2 or greater.
    Type: Application
    Filed: May 31, 2022
    Publication date: December 15, 2022
    Inventors: Nozomi TERAI, Yuusuke KOIZUKA, Naoto SHIMURA, Tatsuya TAKARADA
  • Publication number: 20220324241
    Abstract: A printing method includes discharging ink to a substrate, heating a non-ink-discharged side of the substrate at T1, and heating an ink-discharged side of the substrate at T2, wherein the ink contains an organic solvent A (boiling point lower than 250 degrees C.), an organic solvent B (boiling point of 250 degrees C.), and a resin, where 0 degrees C. C?T2?T1?90 degrees C. is satisfied, the proportion (organic solvent A/ink) is 30 percent by mass or less, the proportion (organic solvent B/ink) is 1 to 3 percent by mass, the proportion (resin/ink) is 5 to 15 percent by mass, the ink has a viscosity of 8.0 to 11.0 mPa-s at 25 degrees C. and 5.5 to 11.0 mPa-s at 36 degrees C., and a 2.5 ?L ink droplet discharged to the substrate shrinks to 0.1 ?L within 10.0 seconds at 25 degrees C.
    Type: Application
    Filed: March 29, 2022
    Publication date: October 13, 2022
    Inventors: Naoto SHIMURA, Yuya HIROKAWA, Yuusuke KOIZUKA, Takayuki SHIMIZU, Itsuro SASAKI, Shunsuke HORIE, Nozomi TERAI, Kenta HAGIWARA
  • Publication number: 20220119664
    Abstract: Provided is an ink set including standard ink and light ink. Standard ink includes cyan, magenta, and yellow inks. Light ink includes a light cyan or light magenta ink, or both. The pigment concentration in cyan ink is 1.9% by mass or greater but 3.6% by mass or less. The pigment concentration in light cyan ink is 0.4% by mass or greater but 1.4% by mass or less. The pigment concentration in magenta ink is 1.9% by mass or greater but 3.6% by mass or less. The pigment concentration in light magenta ink is 0.4% by mass or greater but 1.4% by mass or less. The light ink contains water, organic solvent, and resin. The organic solvent contains amide compound represented by General formula (1). In General formula (1), R1, R2, and R3 each represent a hydrocarbon group containing from 1 through 8 carbon atoms.
    Type: Application
    Filed: September 23, 2021
    Publication date: April 21, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuusuke Koizuka, Naoto Shimura, Nozomi Terai, Tatsuya Takarada
  • Publication number: 20220118786
    Abstract: Printed matter includes a substrate comprising a vinyl chloride resin and a printing layer on the substrate, wherein the surface of the substrate has a static friction coefficient of from 0.04 to 0.06 and a dynamic friction coefficient of from 0.02 to 0.03 when the surface of the substrate is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g, wherein the surface of the printing layer has a static friction coefficient of from 0.35 to 0.50 and a dynamic friction coefficient of from 0.20 to 0.30 when the surface of the printing layer is rubbed with standard adjacent fabrics for staining for color fastness test under a load of 200 g.
    Type: Application
    Filed: October 8, 2021
    Publication date: April 21, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Tatsuya TAKARADA, Yuusuke Koizuka, Naoto Shimura, Nozomi Terai, Takayuki Shimizu, Mio Akima
  • Patent number: 11104137
    Abstract: Provided is a liquid discharging apparatus including a liquid discharging unit configured to discharge a liquid, and a dummy discharge receptacle including an absorbing member configured to absorb a liquid dummy-discharged by the liquid discharging unit, wherein the liquid discharging unit discharges a liquid having a resin content of 5% by mass or greater, and wherein the absorbing member of the dummy discharge receptacle is formed of melamine foam.
    Type: Grant
    Filed: March 16, 2020
    Date of Patent: August 31, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuichi Tanioku, Hisashi Habashi, Yuusuke Koizuka, Koji Katsuragi, Yuuki Yokohama, Masaki Kudo
  • Publication number: 20210155012
    Abstract: An inkjet printing device includes an ink container accommodating a clear ink containing a resin and an organic solvent, a discharging head including a nozzle plate, the discharging head being configured to discharge the clear ink onto a substrate to form a printing layer on the substrate, and a heating device configured to heat the substrate, wherein the heating device heats the substrate satisfying the following relationship: Tmatte (degrees C.)>Tgloss (degrees C.), where Tmatte represents a temperature of the substrate in a first printing region when the clear ink is attached to the substrate in a first printing mode and Tgloss represents a temperature of the substrate in a second printing region when the clear ink is attached to the substrate in a second printing mode, wherein the receding contact angle of the clear ink against the nozzle plate is 35 degrees or greater.
    Type: Application
    Filed: November 20, 2020
    Publication date: May 27, 2021
    Inventors: Hiroshi GOTOU, Hiroaki TAKAHASHI, Yuta NAKAMURA, Yuusuke KOIZUKA, Ayaka TANAKA
  • Patent number: 10844235
    Abstract: Ink includes water, a coloring material, and a copolymer including a first structure unit represented by the following Chemical formula 1 and a second structure unit including an anionic group. In the Chemical formula, R represents a hydrogen atom or a methyl group, X represents an alkylene group having 2-4 carbon atoms, and Y represents a substituted or non-substituted straight-chain alkylene group having 5 to 7 carbon atoms.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: November 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuusuke Koizuka, Kazukiyo Nagai, Tomoyuki Shimada, Shigeyuki Harada, Akihiko Matsuyama, Yoshiki Yanagawa, Koichiro Oyama, Takuya Yamazaki, Akiyoshi Sabu
  • Patent number: 10836171
    Abstract: An ink and cleaning liquid set includes an ink comprising a coloring material and a resin and a cleaning liquid comprising water and at least one type of organic solvent, wherein the ink in a dried form has a glass transition temperature of from 40 to 90 degrees C. and the swelling ratio calculated from a mass of a film of the ink in a dried form before and after immersion in the cleaning liquid is 10 percent or greater according to the following relationship 1: swelling ratio (percent)=100×[(B?A)/A] Relationship 1, where A represents the mass of the film before the immersion and B represents the mass of the film after the immersion.
    Type: Grant
    Filed: July 10, 2019
    Date of Patent: November 17, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Amika Sagara, Yuuki Yokohama, Masaki Kudo, Yuusuke Koizuka, Akihiko Matsuyama, Koichiro Oyama
  • Patent number: 10807377
    Abstract: An ink, includes water; a coloring material; and a cross-linked copolymer having a structure unit represented by the following Chemical formula 1, and a structure unit represented by the following Chemical formula 2, in Chemical formula 1, X represents a hydrogen atom or a cation and R1 represents a hydrogen atom or a methyl group, in Chemical formula 2, R2 represents a hydrogen atom or a methyl group, L represents an alkylene group having 2 to 18 carbon atoms, and * represents an atomic bond.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: October 20, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Yamazaki, Shigeyuki Harada, Takuya Saiga, Hiroshi Gotou, Yuusuke Koizuka, Koichiro Oyama
  • Publication number: 20200316945
    Abstract: Provided is a liquid discharging apparatus including a liquid discharging unit configured to discharge a liquid, and a dummy discharge receptacle including an absorbing member configured to absorb a liquid dummy-discharged by the liquid discharging unit, wherein the liquid discharging unit discharges a liquid having a resin content of 5% by mass or greater, and wherein the absorbing member of the dummy discharge receptacle is formed of melamine foam.
    Type: Application
    Filed: March 16, 2020
    Publication date: October 8, 2020
    Inventors: Yuichi Tanioku, Hisashi Habashi, Yuusuke Koizuka, Koji Katsuragi, Yuuki Yokohama, Masaki Kudo
  • Patent number: 10781325
    Abstract: A curable composition includes an acrylamide compound represented by the following Chemical formula 1: where R1 represents an alkyl group having 1 to 6 carbon atoms, X represents an alkylene group having 1 to 6 carbon atoms, and Y represents the following Chemical formula 2 or the following Chemical formula 3, where R2 represents an alkyl group having 1 to 10 carbon atoms and * represents a bond site with X, where R2 represents an alkyl group having 1 to 10 carbon atoms and * represents a bond site with X.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: September 22, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsunobu Morita, Soh Noguchi, Takashi Okada, Kazukiyo Nagai, Yuusuke Koizuka, Tomoyuki Shimada
  • Publication number: 20200016898
    Abstract: An ink and cleaning liquid set includes an ink comprising a coloring material and a resin and a cleaning liquid comprising water and at least one type of organic solvent, wherein the ink in a dried form has a glass transition temperature of from 40 to 90 degrees C. and the swelling ratio calculated from a mass of a film of the ink in a dried form before and after immersion in the cleaning liquid is 10 percent or greater according to the following relationship 1: swelling ratio (percent)=100×[(B?A)/A] Relationship 1, where A represents the mass of the film before the immersion and B represents the mass of the film after the immersion.
    Type: Application
    Filed: July 10, 2019
    Publication date: January 16, 2020
    Inventors: Amika SAGARA, Yuuki YOKOHAMA, Masaki KUDO, Yuusuke KOIZUKA, Akihiko MATSUYAMA, Koichiro OYAMA
  • Publication number: 20190276694
    Abstract: An ink comprises water, a coloring material, and a cross-linked material comprising a structure unit represented by the following Chemical formula 1 and a structure unit represented by the following Chemical formula 2, in Chemical formula 1, X represents a hydrogen atom or a cation and R1 represents a hydrogen atom or a methyl group, in Chemical formula 2, R2 represents a hydrogen atom or a methyl group, L represents an alkylene group having 2 to 18 carbon atoms, and * represents an atomic bond.
    Type: Application
    Filed: March 5, 2019
    Publication date: September 12, 2019
    Inventors: Takuya YAMAZAKI, Shigeyuki HARADA, Takuya SAIGA, Hiroshi GOTOU, Yuusuke KOIZUKA, Koichiro OYAMA
  • Patent number: 10370548
    Abstract: A copolymer including a structural unit represented by General Formula (1) below, and a structural unit represented by General Formula (2) below, where, in General Formula (1), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation, where, in General Formula (2), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.
    Type: Grant
    Filed: September 14, 2017
    Date of Patent: August 6, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeyuki Harada, Akihiko Matsuyama, Yoshiki Yanagawa, Masayuki Fukuoka, Takuya Yamazaki, Kazukiyo Nagai, Yuusuke Koizuka, Tomoyuki Shimada, Akiyoshi Sabu