Patents by Inventor Koichiro OYAMA

Koichiro OYAMA 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).

  • COPOLYMER, COLORING MATERIAL DISPERSION, INK, AND INK STORE CONTAINER
    Publication number: 20170158794
    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), R is a hydrogen atom or a methyl group and X is a hydrogen atom or a cation, where, in General Formula (2), L is an alkylene group having 2 or more but 18 or less carbon atoms.
    Type: Application
    Filed: December 1, 2016
    Publication date: June 8, 2017
    Inventors: Shigeyuki HARADA, Kazukiyo NAGAI, Yuusuke KOIZUKA, Tomoyuki SHIMADA, Takuya YAMAZAKI, Koichiro OYAMA, Akiyoshi SABU, Akihiko MATSUYAMA, Yoshiki YANAGAWA
  • INK, METHOD OF MANUFACTURING INK, AND INK CARTRIDGE
    Publication number: 20170121544
    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: Application
    Filed: September 30, 2016
    Publication date: May 4, 2017
    Inventors: Yuusuke KOIZUKA, Kazukiyo NAGAI, Tomoyuki SHIMADA, Shigeyuki HARADA, Akihiko MATSUYAMA, Yoshiki YANAGAWA, Koichiro OYAMA, Takuya YAMAZAKI, Akiyoshi SABU
  • PARTICULATE POLYAMIDE, AND METHOD FOR PREPARING THE PARTICULATE POLYAMIDE
    Publication number: 20160272776
    Abstract: A particulate polyamide is provided. The particulate polyamide is porous and includes at least one of polyamide 4 and polyamide 3. In addition, the particulate polyamide has a particle diameter (d50) of from 10 ?m to 1,000 ?m and a particle diameter dispersion degree (Dv/Dn) of not greater than 3.0, wherein Dv represents the volume average particle diameter of the particulate polyamide, and Dn represents the number average particle diameter of the particulate polyamide.
    Type: Application
    Filed: March 18, 2016
    Publication date: September 22, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yoko ARAI, Atsumi YAMABE, Koichiro OYAMA, Yasuo KAMADA