Patents by Inventor Koji Katsuragi

Koji Katsuragi 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: 11701911
    Abstract: A method of printing a stealth white image includes applying a stealth ink containing a red coloring material that emits visible light at exposure to ultraviolet radiation and a green coloring material that emits visible light at exposure to ultraviolet radiation to a substrate which contains a fluorescent brightener to form the stealth white image thereon, wherein the stealth white image demonstrates an a* value of from ?2.0 to 2.0 and a b* value of from ?10.0 to 0 at exposure to ultraviolet radiation having a wavelength of 370 nm according to CIE 1976 L*a*b* colorimetric system.
    Type: Grant
    Filed: November 13, 2020
    Date of Patent: July 18, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Koji Katsuragi, Haruki Saitoh
  • Patent number: 11560491
    Abstract: A liquid composition includes an inorganic particle and a multivalent metal salt, wherein the liquid composition has a tacking force of 50 mN or less in an area of cast-coated paper where the liquid composition is applied in an amount of 0.12 mg/cm2 for the cast-coated paper followed by heating at 80 degrees C. for 15 seconds.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: January 24, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Dongsik Jang, Yukitaka Watarai, Tsutomu Maekawa, Takashi Tamai, Atsufumi Hanazawa, Koji Katsuragi
  • Publication number: 20220372315
    Abstract: An ink contains a coloring material, a water-soluble organic solvent. a compound represented by the following Chemical Formula 1 or Chemical Formula 2, a surfactant containing a first silicone-based compound having an HLB value of from 7.0 to 9.0 and a second silicone-based compound having an HLB value of from 14.0 to 18.0, and water, where, m represents an integer of from 1 to 4, where R1 represents an alkyl group having 1 to 20 carbon atoms, an aralkyl group having 7 or 8 carbon atoms, or an ally group, 1 represents 0 or an integer of from 1 to 7, and n represents an integer of from 20 to 200.
    Type: Application
    Filed: April 18, 2022
    Publication date: November 24, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Koji KATSURAGI, Takashi Sugawara, Haruki Saitoh
  • Publication number: 20220112388
    Abstract: An ink contains a coloring material, a water-soluble organic solvent, water, an acetylene-based compound having an HLB of from 8 to 13, and a compound represented by Chemical Formula 1 or Chemical Formula 2, where m represents an integer of from 1 to 4, where R1 represents an alkyl group having 1 to 20 carbon atoms, aralkyl group having 7 or 8 carbon atoms, or ally group, 1 represents 0 or an integer of from 1 to 7, and n represents an integer of from 20 to 200.
    Type: Application
    Filed: October 7, 2021
    Publication date: April 14, 2022
    Applicant: Ricoh Company, Ltd.
    Inventor: Koji KATSURAGI
  • 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: 20210146708
    Abstract: A method of printing a stealth white image includes applying a stealth ink containing a red coloring material that emits visible light at exposure to ultraviolet radiation and a green coloring material that emits visible light at exposure to ultraviolet radiation to a substrate which contains a fluorescent brightener to form the stealth white image thereon, wherein the stealth white image demonstrates an a* value of from ?2.0 to 2.0 and a b* value of from ?10.0 to 0 at exposure to ultraviolet radiation having a wavelength of 370 nm according to CIE 1976 L*a*b* colorimetric system.
    Type: Application
    Filed: November 13, 2020
    Publication date: May 20, 2021
    Inventors: Koji KATSURAGI, Haruki SAITOH
  • Publication number: 20210147701
    Abstract: A stealth white ink contains a red coloring material that emits visible light at exposure to ultraviolet radiation, a green coloring material that emits visible light at exposure to ultraviolet radiation, and a blue coloring material that emits visible light at exposure to ultraviolet radiation, wherein a dry film of the stealth white ink has an a* value of from ?2.0 to 2.0 and a b* of from ?10.0 to 0 at exposure to ultraviolet radiation having a wavelength of 370 nm according to CIE 1976 L*a*b* colorimetric system.
    Type: Application
    Filed: November 2, 2020
    Publication date: May 20, 2021
    Inventors: Koji KATSURAGI, Haruki SAITOH
  • Patent number: 10947398
    Abstract: A white ink includes a hollow resin particle, an organic solvent, an acrylic silicone resin, and water, wherein the acrylic silicone resin has a resin solubility parameter smaller than that of the hollow resin particle.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: March 16, 2021
    Assignee: Ricoh Company, Ltd.
    Inventor: Koji Katsuragi
  • Publication number: 20200399495
    Abstract: A liquid composition includes an inorganic particle and a multivalent metal salt, wherein the liquid composition has a tacking force of 50 mN or less in an area of cast-coated paper where the liquid composition is applied in an amount of 0.12 mg/cm2 for the cast-coated paper followed by heating at 80 degrees C. for 15 seconds.
    Type: Application
    Filed: January 28, 2019
    Publication date: December 24, 2020
    Inventors: Dongsik JANG, Yukitaka WATARAI, Tsutomu MAEKAWA, Takashi TAMAI, Atsufumi HANAZAWA, Koji KATSURAGI
  • Patent number: 10851253
    Abstract: An image forming method includes applying white ink containing hollow resin particulate to a recording medium and contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: December 1, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsutomu Maekawa, Koji Katsuragi, Takashi Tamai, Atsufumi Hanazawa, Dongsik Jang
  • 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: 10647129
    Abstract: A printing method includes applying a processing fluid to a recording medium and applying an ink to the recording medium, wherein the processing fluid contains a first nonionic resin including the following structure unit a-1, the first nonionic resin having a glass transition temperature of 15 degrees C.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: May 12, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsufumi Hanazawa, Hiroshi Gotou, Tsutomu Maekawa, Yukitaka Watarai, Koji Katsuragi, Tomohiro Nakagawa
  • Patent number: 10596823
    Abstract: An ink set includes a white ink including a hollow particle accounting for 5.0 to 25.0 percent by mass of the white ink and a non-white ink, wherein, in an infrared spectrum for a dried film of the white ink, a ratio (Y/X) of the maximum value Y in an absorption band of from 1720 to 1740 cm?1 to the maximum value X in an absorption band of from 1590 to 1610 cm?1, is from 3.0 to 6.0, wherein the non-white ink has a surface tension of from 20.0 to 30.0 mN/m at a bubble lifetime of 1500 ms.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: March 24, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventor: Koji Katsuragi
  • Publication number: 20190284412
    Abstract: An image forming method includes applying white ink containing hollow resin particulate to a recording medium and contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium.
    Type: Application
    Filed: March 15, 2019
    Publication date: September 19, 2019
    Inventors: Tsutomu MAEKAWA, Koji KATSURAGI, Takashi TAMAI, Atsufumi HANAZAWA, Dongsik JANG
  • Patent number: 10316205
    Abstract: Recorded matter includes a recording medium and an image on the recording medium. The image comprises a hollow resin including a copolymer of the structure unit represented by the following chemical formula 1 and the structure unit represented by the following chemical formula 2. Also, in an IR spectrum of the image, the image satisfies the following ratio: 3.0?Y/X?6.0, where X represents the absorbance of the image at the maximum absorption wavelength in a range of from 1,590 to 1,610 cm?1 and Y represents the absorbance of the image at the maximum absorption wavelength in a range of from 1,720 to 1,740 cm?1.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: June 11, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Koji Katsuragi
  • Publication number: 20190105919
    Abstract: An ink set includes a white ink including a hollow particle accounting for 5.0 to 25.0 percent by mass of the white ink and a non-white ink, wherein, in an infrared spectrum for a dried film of the white ink, a ratio (Y/X) of the maximum value Y in an absorption band of from 1720 to 1740 cm?1 to the maximum value X in an absorption band of from 1590 to 1610 cm?1, is from 3.0 to 6.0, wherein the non-white ink has a surface tension of from 20.0 to 30.0 mN/m at a bubble lifetime of 1500 ms.
    Type: Application
    Filed: September 18, 2018
    Publication date: April 11, 2019
    Inventor: Koji KATSURAGI
  • Patent number: 10150880
    Abstract: Provided is an ink set including: a first ink that is white and contains water, hollow resin particles, and at least one organic solvent; and a second ink that contains water and at least one organic solvent and is to be applied on a first image formed with the first ink to form a second image, wherein an average thickness difference (A?B) between an average thickness (A) of the first image before the second ink is applied and an average thickness (B) of a white region in the first image after the second image is formed is 1 ?m or greater but 3 ?m or less.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: December 11, 2018
    Assignee: Ricoh Company, Ltd.
    Inventor: Koji Katsuragi
  • Publication number: 20180265728
    Abstract: A printing method includes applying a processing fluid to a recording medium and applying an ink to the recording medium, wherein the processing fluid contains a first nonionic resin including the following structure unit a-1, the first nonionic resin having a glass transition temperature of 15 degrees C.
    Type: Application
    Filed: March 7, 2018
    Publication date: September 20, 2018
    Inventors: Atsufumi Hanazawa, Hiroshi Gotou, Tsutomu Maekawa, Yukitaka Watarai, Koji Katsuragi, Tomohiro Nakagawa
  • Publication number: 20180094150
    Abstract: Recorded matter includes a recording medium and an image on the recording medium. The image comprises a hollow resin including a copolymer of the structure unit represented by the following chemical formula 1 and the structure unit represented by the following chemical formula 2. Also, in an IR spectrum of the image, the image satisfies the following ratio: 3.0?Y/X?6.0, where X represents the absorbance of the image at the maximum absorption wavelength in a range of from 1,590 to 1,610 cm?1 and Y represents the absorbance of the image at the maximum absorption wavelength in a range of from 1,720 to 1,740 cm?1.
    Type: Application
    Filed: September 27, 2017
    Publication date: April 5, 2018
    Inventor: Koji KATSURAGI
  • Publication number: 20170313896
    Abstract: A white ink includes a hollow resin particle, an organic solvent, an acrylic silicone resin, and water, wherein the acrylic silicone resin has a resin solubility parameter smaller than that of the hollow resin particle.
    Type: Application
    Filed: April 24, 2017
    Publication date: November 2, 2017
    Inventor: Koji KATSURAGI