Patents by Inventor Kazuhiko Umemura

Kazuhiko Umemura 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: 20230331000
    Abstract: A printing method involves applying a processing fluid containing a multivalent metal salt to a print medium, to form a processing fluid layer; applying a white ink containing a white coloring material and water to form a white ink layer; and applying a non-white ink containing a non-white coloring material and water to the white ink layer, after securing a time interval of 0.5 seconds or longer after the white ink is applied without drying with a drying unit after the white ink is applied. The print medium has a Cobb water absorption of 20 g/m2 or greater but 75 g/m2 or less when contacted with water for 120 seconds, where the Cobb water absorption is stipulated by JIS-P8140.
    Type: Application
    Filed: August 20, 2021
    Publication date: October 19, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Sei Yamamoto, Tomohiro Nakagawa, Kazuhiko Umemura, Yuya Hirokawa, Hiroki Hagiwara, Takuya Saiga
  • Publication number: 20230220226
    Abstract: An ink set includes a non-white ink and a white ink. The non-white ink contains water, a coloring material, an organic solvent, and an acetylene glycol compound. The white ink contains water, a coloring material, an organic solvent, and a compound represented by General formula (1) below where R represents a hydrogen atom or a methyl group, n1 and n2 represent integers of from 1 through 7, k represents an integer of from 0 through 5, and m represents an integer of from 1 through 20.
    Type: Application
    Filed: April 27, 2021
    Publication date: July 13, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroki HAGIWARA, Tomohiro Nakagawa, Kazuhiko Umemura, Masayuki Koyano, Sei Yamamoto, Yuya Hirokawa, Takuya Saiga
  • Publication number: 20230051878
    Abstract: Provided is an image printing method including a first processing fluid applying step of applying a first processing fluid containing a multivalent metal salt to a predetermined region of a print medium, and a second processing fluid applying step of applying a second processing fluid containing a resin emulsion containing an anionic functional group to the predetermined region of the print medium to which the first processing fluid is applied and any other region of the print medium to which the first processing fluid is not applied.
    Type: Application
    Filed: July 28, 2022
    Publication date: February 16, 2023
    Inventors: Sei YAMAMOTO, Kazuhiko UMEMURA, Yuya HIROKAWA, Hiroki HAGIWARA, Takuya SAIGA, Risa TAMURA
  • Patent number: 11578220
    Abstract: An ink contains water, Pigment Red 269, a compound represented by the following Chemical formula (1), and at least one of a silicone compound and an acetylene glycol compound, where the proportion of the compound represented by the following Chemical formula (1) to the Pigment Red 269 is 2.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: February 14, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Nakagawa, Hiroki Hagiwara, Yuutaroh Nonaka, Yuusuke Fujita, Kazuhiko Umemura, Sei Yamamoto
  • Patent number: 11548294
    Abstract: A method of printing includes applying a processing fluid to a substrate and inkjet discharging a white ink to the substrate onto which the processing fluid has been applied, wherein the processing fluid contains a tri-valent metal salt, a nonionic urethane resin, and water and the white ink contains a white pigment, a resin, and water.
    Type: Grant
    Filed: October 10, 2021
    Date of Patent: January 10, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takuya Saiga, Sei Yamamoto, Kazuhiko Umemura, Yuya Hirokawa, Hiroki Hagiwara
  • Patent number: 11499062
    Abstract: An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: November 15, 2022
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Gotou, Yoshiaki Masuda, Masahiko Ishikawa, Masaki Kudo, Kazuhiko Umemura, Keita Katoh, Akihiko Matsuyama, Masayasu Nonogaki, Takeshi Shibuya
  • Publication number: 20220177718
    Abstract: An ink contains organic solvents containing 1,2-propane diol and 1,2-hexane diol, a pigment, water, and a polyoxyethylene ether compound.
    Type: Application
    Filed: December 6, 2021
    Publication date: June 9, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Kazuhiko Umemura, Sei Yamamoto, Yuya Hirokawa, Hiroki Hagiwara, Takuya Saiga, Tomohiro Nakagawa
  • Publication number: 20220169034
    Abstract: Provided is a processing fluid including nonionic acrylic resin particles, and a polyvalent metal salt. A volume average particle diameter of the nonionic acrylic resin particles is 100 nm or greater but 300 nm or less. A proportion of the nonionic acrylic resin particles in the processing fluid is greater than 2.0% by mass. An average reflectance of the processing fluid to light having a wavelength of 400 nm or greater but 700 nm or less is 70% or greater.
    Type: Application
    Filed: November 22, 2021
    Publication date: June 2, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroki HAGIWARA, Tomohiro Nakagawa, Sei Yamamoto, Kazuhiko Umemura, Yuya Hirokawa, Takuya Saiga, Risa Tamura
  • Publication number: 20220118774
    Abstract: A method of printing includes applying a processing fluid to a substrate and inkjet discharging a white ink to the substrate onto which the processing fluid has been applied, wherein the processing fluid contains a tri-valent metal salt, a nonionic urethane resin, and water and the white ink contains a white pigment, a resin, and water.
    Type: Application
    Filed: October 10, 2021
    Publication date: April 21, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Takuya SAIGA, Sei Yamamoto, Kazuhiko Umemura, Yuya Hirokawa, Hiroki Hagiwara
  • Patent number: 11274221
    Abstract: An ink includes at least one polyether-modified siloxane compound, and at least one aliphatic alcohol alkylene oxide compound. The mass ratio of the polyether-modified siloxane compound to the aliphatic alcohol alkylene oxide compound in the ink is from 95/5 to 50/50.
    Type: Grant
    Filed: October 24, 2018
    Date of Patent: March 15, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuhiko Umemura, Yuuki Yokohama, Akihiko Matsuyama, Amika Sagara, Masaki Kudo, Mayumi Yoshihara, Kento Sugita
  • Publication number: 20220056299
    Abstract: A printing method includes: a processing fluid applying step of applying a processing fluid containing silica and a multivalent metal salt to a print medium; and an ink applying step of applying an ink containing a coloring material and water to the print medium. The print medium has a Cobb water absorption of 20 g/m2 or greater but 75 g/m2 or less when contacted with water for 120 seconds. The Cobb water absorption is stipulated by JIS-P8140.
    Type: Application
    Filed: July 28, 2021
    Publication date: February 24, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Sei Yamamoto, Tomohiro Nakagawa, Kazuhiko Umemura, Masayuki Koyano, Yuya Hirokawa, Takuya Saiga, Hiroki Hagiwara
  • Publication number: 20220056298
    Abstract: Provided is a processing fluid including: water; a flocculant; and a urethane resin. A dry film formed of the processing fluid and having an average thickness of 500 micrometers has a tensile strength of 3.5 MPa or greater and a breaking elongation of 80% or greater.
    Type: Application
    Filed: July 27, 2021
    Publication date: February 24, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Kazuhiko Umemura, Tomohiro Nakagawa, Hiroki Hagiwara, Sei Yamamoto, Masayuki Koyano, Yuya Hirokawa, Takuya Saiga
  • Patent number: 11186737
    Abstract: An ink includes water, a compound represented by the following Chemical formula 1, Pigment Red 269 represented by the following Chemical formula 2, and alkylene glycol alkyl ether, wherein the proportion of the compound represented by the following Chemical formula 1 in a total amount of the Pigment Red 269 is 2 or less percent by mass.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: November 30, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiro Nakagawa, Hiroki Hagiwara, Yuutaroh Nonaka, Kazuhiko Umemura
  • Publication number: 20210292578
    Abstract: An ink contains water, Pigment Red 269, a compound represented by the following Chemical formula (1), and at least one of a silicone compound and an acetylene glycol compound, where the proportion of the compound represented by the following Chemical formula (1) to the Pigment Red 269 is 2.
    Type: Application
    Filed: March 11, 2021
    Publication date: September 23, 2021
    Inventors: Tomohiro NAKAGAWA, Hiroki HAGIWARA, Yuutaroh NONAKA, Yuusuke FUJITA, Kazuhiko UMEMURA, Sei YAMAMOTO
  • Patent number: 11059983
    Abstract: An ink comprises a pigment, a quinacridone derivative represented by the following Chemical formula 1. where R1, R2, R3, and R4 each, independently represent hydrogen atoms, halogen atoms, or alkyl groups having 1 to 4 carbon atoms. R5 and R6 each, independently represent alkyl groups having 1 to 4 carbon atoms, and m and n each, independently represent 0, 1, or 2, excluding a case where both m and n are simultaneously 0, and a solvent A having an SP value of from 9.0 to 11.0, wherein the proportion of the solvent A in the ink is less than 10 percent by mass.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: July 13, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Akihiko Matsuyama, Yuuki Yokohama, Amika Sagara, Masaki Kudo, Kazuhiko Umemura, Yukihiro Imanaga, Mayumi Yoshihara
  • Publication number: 20200399496
    Abstract: A liquid composition for surface treatment includes a nonionic resin particle, and a multivalent metal salt, wherein the contact angle of water against a film of the liquid composition is 15 or less degrees.
    Type: Application
    Filed: June 9, 2020
    Publication date: December 24, 2020
    Inventors: Yuutaroh NONAKA, Tomohiro Nakagawa, Hiroki Hagiwara, Kazuhiko Umemura, Yuusuke Fujita, Nozomi Terai
  • Publication number: 20200385592
    Abstract: An ink includes water, a compound represented by the following Chemical formula 1, Pigment Red 269 represented by the following Chemical formula 2, and alkylene glycol alkyl ether, wherein the proportion of the compound represented by the following Chemical formula 1 in a total amount of the Pigment Red 269 is 2 or less percent by mass.
    Type: Application
    Filed: June 1, 2020
    Publication date: December 10, 2020
    Inventors: Tomohiro NAKAGAWA, Hiroki HAGIWARA, Yuutaroh NONAKA, Kazuhiko UMEMURA
  • Publication number: 20200262228
    Abstract: An image forming method includes applying a pre-processing fluid to a non-absorptive recording medium, the pre-processing fluid containing a multi-valent metal salt and at least one organic solvent and applying a magenta ink containing C.I. Pigment Red 269 and at least one organic solvent, wherein the mixing SP value of the at least one organic solvent contained in the pre-processing fluid is from 10.0 to 12.0 (cal/cm3), wherein the mixing SP value of the at least one organic solvent contained in the magenta ink is from 12.0 to 14.0 (cal/cm3).
    Type: Application
    Filed: February 19, 2020
    Publication date: August 20, 2020
    Inventors: Hiroki HAGIWARA, Tomohiro NAKAGAWA, Kazuhiko UMEMURA, Yuutaroh NONAKA
  • Publication number: 20200157366
    Abstract: An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.
    Type: Application
    Filed: June 27, 2018
    Publication date: May 21, 2020
    Inventors: Hiroshi GOTOU, Yoshiaki MASUDA, Masahiko ISHIKAWA, Masaki KUDO, Kazuhiko UMEMURA, Keita KATOH, Akihiko MATSUYAMA, Masayasu NONOGAKI, Takeshi SHIBUYA
  • Patent number: 10414932
    Abstract: Ink includes water, a pigment, an organic solvent including glycol ether, and a surfactant including a silicone-based surfactant and a salt of sulfo succinic acid dialkyl ester. As measured by maximum bubble pressure technique at 23 degrees C., the dynamic surface tension of the ink at 15 msec is not greater than 31 mN/m and the difference between the dynamic surface tension of the ink at 15 msec and the dynamic surface tension of the ink at 1,500 msec is not greater than 4.0 mN/m.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: September 17, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuhiko Umemura, Hiroyuki Fushimi, Yoshihiro Moriya, Tamotsu Aruga