Patents by Inventor Hisashi Teraoka

Hisashi Teraoka 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).

  • Ink, ink-jet recording process, recording unit, ink cartridge and ink-jet recording apparatus
    Patent number: 6221141
    Abstract: Disclosed herein is a pigment ink comprising self-dispersing type carbon black to the surface of which at least one hydrophilic group is bonded through another atomic group, an aqueous medium, and a silicon compound. The pigment ink can form images excellent in fastness properties such as water fastness and light fastness and character quality, can be efficiently ejected when applied to ink-jet recording and can also be stably ejected from a recording head irrespective of recording head and printing environment.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: April 24, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoichi Takada, Yoshihisa Takizawa, Shinya Mishina, Mikio Sanada, Hisashi Teraoka, Koichi Osumi
  • Water-based pigment ink, and ink-jet recording method and instruments using the same
    Patent number: 5976233
    Abstract: Disclosed herein is a water-based pigment ink comprising a coloring material composed of self-dispersing carbon black obtained by bonding at least one hydrophilic group directly or through another atomic group to the surface of carbon black, a humectant of the general formulaH--(CH.sub.2).sub.m --C--((CH.sub.2).sub.n OH).sub.3wherein m and n are independently an integer of from 1 to 5, and an aqueous medium composed of water and a water-soluble organic solvent.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: November 2, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Osumi, Yoshifumi Hattori, Yoshihisa Takizawa, Ryuji Katsuragi, Hisashi Teraoka
  • Ink, ink cartridge and recording unit, ink-jet recording method and ink-jet recording apparatus
    Patent number: 5865883
    Abstract: Provided is an ink used for ink-jet recording, which ink comprises triethanolamine in an amount of 2% by weight or more, but less than 5% by weight based on the total weight of the ink and a dye having a pyrene ring.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: February 2, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hisashi Teraoka, Akira Nagashima
  • Ink, and ink-jet recording method and instrument using the same
    Patent number: 5451251
    Abstract: Disclosed herein is an ink comprising a coloring material and a liquid medium dissolving the coloring material therein, wherein the ink comprises a dye having at least one ammonium ion as a counter ion and an ammonium salt of an inorganic or organic acid.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: September 19, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kumiko Mafune, Tsuyoshi Eida, Keiichi Murai, Yoshifumi Hattori, Mayumi Yamamoto, Osamu Nishiwaki, Yoshihisa Takizawa, Takao Yamamoto, Akira Nagashima, Masahiko Tonogaki, Shinichi Sato, Ryuji Katsuragi, Mikio Sanada, Hisashi Teraoka, Eriko Saito