Patents by Inventor Yuki KAJI

Yuki KAJI 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).

  • COLORED DISPERSION FOR INKJET, INKJET RECORDING INK, AND INKJET RECORDING METHOD
    Publication number: 20230257605
    Abstract: A colored dispersion for inkjet and a method for producing the same, the colored dispersion including a colorant, a dispersant, a tellurium compound, and water, in which the dispersant is an A-B block polymer; monomers constituting an A block are (meth)acrylic acid and butyl (meth)acrylate; the content of the (meth)acrylic acid in the A block is 26-42 mass %; a monomer constituting a B block includes cyclohexyl (meth)acrylate; the acid value of the dispersant is 100-159 mg KOH/g; and the mass-average molecular weight of the dispersant is 10,000-50,000. An inkjet recording ink containing the dispersion; an inkjet recording method using the ink; recording media to which the ink adheres; and an inkjet printer equipped with a container containing the ink.
    Type: Application
    Filed: July 29, 2021
    Publication date: August 17, 2023
    Inventors: Yuki KAJI, Maiko IWAMI, Michiaki TAKEDA, Aiko MATSUMURA
  • Ink, inkjet printing method, and printed matter
    Patent number: 11649364
    Abstract: An ink is provided. The ink comprises a colorant, water, an organic solvent comprising a glycol ether having a solubility parameter of from 9.0 to 12.0 (cal/cm3)1/2, and a surfactant comprising a silicone-based surfactant (a) and a nonionic surfactant (b).
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: May 16, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroki Hagiwara, Tomohiro Nakagawa, Yuki Kaji
  • Image forming method, image forming device, and method of manufacturing printed matter
    Patent number: 10906330
    Abstract: An image forming method includes applying a pre-processing fluid to a non-permeable recording medium, jetting an ink to the non-permeable recording medium, and accelerating drying the pre-processing fluid applied to and the ink jetted to the non-permeable recording medium, wherein the pre-processing fluid contains a multivalent metal salt and a resin particle.
    Type: Grant
    Filed: December 6, 2018
    Date of Patent: February 2, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Nakagawa, Hiroki Hagiwara, Yuki Kaji
  • Image forming method and image forming device
    Patent number: 10773532
    Abstract: An image forming method includes coating a non-absorptive recording medium with a pre-processing fluid containing a metal salt and a resin A; and applying a magenta ink to the non-absorptive recording medium which has been coated with the pre-processing fluid, wherein the magenta ink contains a resin B having a glass transition temperature higher than the glass transition temperature of the resin A and C.I.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: September 15, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuki Kaji, Tomohiro Nakagawa, Hiroki Hagiwara
  • INK, INKJET PRINTING METHOD, AND PRINTED MATTER
    Publication number: 20200095444
    Abstract: An ink is provided. The ink comprises a colorant, water, an organic solvent comprising a glycol ether having a solubility parameter of from 9.0 to 12.0 (cal/cm3)1/2, and a surfactant comprising a silicone-based surfactant (a) and a nonionic surfactant (b).
    Type: Application
    Filed: September 17, 2019
    Publication date: March 26, 2020
    Inventors: Hiroki HAGIWARA, Tomohiro Nakagawa, Yuki Kaji
  • IMAGE FORMING METHOD AND IMAGE FORMING DEVICE
    Publication number: 20190389231
    Abstract: An image forming method includes coating a non-absorptive recording medium with a pre-processing fluid containing a metal salt and a resin A; and applying a magenta ink to the non-absorptive recording medium which has been coated with the pre-processing fluid, wherein the magenta ink contains a resin B having a glass transition temperature higher than the glass transition temperature of the resin A and C.I.
    Type: Application
    Filed: June 21, 2019
    Publication date: December 26, 2019
    Inventors: Yuki KAJI, Tomohiro Nakagawa, Hiroki Hagiwara
  • IMAGE FORMING METHOD, IMAGE FORMING DEVICE, AND METHOD OF MANUFACTURING PRINTED MATTER
    Publication number: 20190168516
    Abstract: An image forming method includes applying a pre-processing fluid to a non-permeable recording medium, jetting an ink to the non-permeable recording medium, and accelerating drying the pre-processing fluid applied to and the ink jetted to the non-permeable recording medium, wherein the pre-processing fluid contains a multivalent metal salt and a resin particle.
    Type: Application
    Filed: December 6, 2018
    Publication date: June 6, 2019
    Inventors: Tomohiro NAKAGAWA, Hiroki HAGIWARA, Tatsuya MORITA, Yuki KAJI