Patents by Inventor Eriko Saito

Eriko Saito 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).

  • Method and apparatus for ink-jet printing
    Patent number: 6062674
    Abstract: When a black image region is printed, the overall pixels in the region is printed by a black ink. Then, a cation type cyan ink which makes a coloring agent in the ink insoluble is printed on the pixels of a predetermined pattern. By this, the dye of the black ink is maintained near the surface of the printing medium to increase density of the black image. At the same time, for preventing variation of tone of the black image, the pixels of the predetermined pattern are printed by a yellow ink.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: May 16, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiharu Inui, Keiichi Murai, Hiromitsu Hirabayashi, Mayumi Yamamoto, Yoshihisa Takizawa, Miyuki Fujita, Fumihiro Gotoh, Masaya Uetsuki, Mikio Sanada, Eriko Saito
  • Ink set and ink-jet recording method using the same
    Patent number: 5911815
    Abstract: Disclosed herein is an ink set comprising in combination at least two inks of different colors, wherein at least one ink comprises a cationic dye and an amphoteric compound, and another ink of a color different from said one ink comprises an anionic dye and a water-soluble anionic polymer or nonionic polymer in addition to the dye.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: June 15, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mayumi Yamamoto, Yoshihisa Takizawa, Mikio Sanada, Eriko Saito
  • Ink, and ink-jet recording method and instruments using the same
    Patent number: 5728201
    Abstract: Disclosed herein is a yellow ink comprising at least two yellow dyes and a liquid medium dissolving or dispersing the dyes therein, wherein the ink comprises a dye represented by the following general formula (1) in the state of a free acid, and a yellow dye having a SO.sub.3 H group as a main solubilizing group in the state of a free acid and having its position in the L*a*b* chromaticity diagram at b*=xa* (3.ltoreq.x.ltoreq..infin.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: March 17, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eriko Saito, Mayumi Yamamoto, Ryuji Katsuragi
  • Ink-jet ink
    Patent number: 5571313
    Abstract: Disclosed herein is an ink-jet ink comprising in combination at least one compound selected from nitrogen compounds consisting of secondary amines and derivatives thereof, tertiary amines and derivative thereof, and complexes thereof and having at least one group selected from the group consisting of alkyl groups, a carboxyl group and the salts thereof, and a sulfonic group and the salts thereof, and a cyclic phosphate in a liquid medium in which a dye is dissolved or dispersed.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: November 5, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kumiko Mafune, Mayumi Yamamoto, Akira Nagashima, Mikio Sanada, Eriko Saito
  • 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