Patents by Inventor Hiroko Hayashi

Hiroko Hayashi 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).

  • Color ink composition and color ink jet printing method
    Patent number: 5560771
    Abstract: A yellow ink composition, a magenta ink composition and cyan ink composition and a solvent system which are suitable for a color ink jet printing method are disclosed. These ink compositions can realize ideal color tones without limitation of properties of paper. Moreover, these ink compositions are excellent in intermittent jetting stability. The color ink jet printing method is also disclosed. In this method, ink compositions are overprinted to mix colors. Colors obtained by the color mixing have an ideal color tone.
    Type: Grant
    Filed: March 29, 1995
    Date of Patent: October 1, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Kiyohiko Takemoto, Hiroyuki Onishi, Masaaki Itano, Yoshiyuki Koike, Etsuko Yoshiike, Miharu Yoshida, Hiroko Hayashi, Kazuhide Kubota
  • Ink compositions for ink jet printing
    Patent number: 5503664
    Abstract: An ink for ink jet printing comprising a pigment, a component selected from the group consisting of saccharides, derivatives thereof and polyols having 5 or more hydroxyl groups, and a resin emulsion. This pigment-type ink is excellent in preservability, does not cause obstruction in a nozzle, and can evenly produce an image.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: April 2, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Yukari Sano, Junko Shimizu, Hiroko Hayashi, Kiyohiko Takemoto, Satoru Arata, Issei Kawabata
  • Chromone derivative, and aldose reductase inhibitor comprising said compound as active component
    Patent number: 5455267
    Abstract: The present invention relates to a chromone derivative and an aldose reductase inhibitor comprising said compound as efective component, which is represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent a lower alkyl group, etc., R.sub.3 represents an oxygen atom, a sulfur atom, etc., R.sub.7 represents a phenyl group substituted or not substituted, etc., and R represents a hydrogen atom or a lower alkoxy group. The present compounds exhibit superior inhititory action on aldose reductase and are useful for the treatment of various complications of diseases in diabetes, such as cataract, retinopathy, keratopathy, nephropathy, and neuropathy.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: October 3, 1995
    Assignee: Tsumura & Co.
    Inventors: Yasushi Igarashi, Takuji Yamaguchi, Yoshimitsu Ogawa, Mika Tomita, Hiroko Hayashi, Toshitsugu Sato, Kunio Hosaka
  • Black ink composition excellent in black
    Patent number: 5439517
    Abstract: An ink composition excellent in blackness and storage stability is disclosed which comprises a first dye represented by the following general formula (I) and a second dye selected from the group consisting of C.I.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: August 8, 1995
    Assignee: Seiko Epson Corporation
    Inventors: Miharu Yoshida, Hiroko Hayashi
  • Ink compositions for ink jet printing
    Patent number: 5324349
    Abstract: An ink for ink jet printing comprising a pigment, a component selected from the group consisting of saccharides, derivatives thereof and polyols having 5 or more hydroxyl groups, and a resin emulsion. This pigment-type ink is excellent in preservability, does not cause obstruction in a nozzle, and can evenly produce an image.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: June 28, 1994
    Assignee: Seiko Epson Corporation
    Inventors: Yukari Sano, Junko Shimizu, Hiroko Hayashi, Kiyohiko Takemoto, Satoru Arata, Issei Kawabata