Patents by Inventor Kazuo Tohda

Kazuo Tohda 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).

  • Patent number: 5914359
    Abstract: Coloring compositions for use in the formation of transparent colored micro-patterns are provided. They comprise colorants, thermosetting or photosensitive resin materials and extenders having an average particle size of not more than 300 nm. The compositions are useful for the fabrication of color filters to be used for display elements such as liquid crystal display (LCD) and solid state imaging devices such as charge-coupled device (CCD). The formed patterns have lower fluctuation in colored layer thickness all over the patterns, superior layer flatness, color levelness and sharpness of pattern boundaries, as well as large purity, clarity and color brightness.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: June 22, 1999
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuo Tohda, Kaori Yamamoto, Kiyoharu Nakatsuka
  • Patent number: 4781444
    Abstract: A color member, for example, a multicolor filter for a display device, and a method for manufacturing the same. An electroconductive layer having a desired pattern is formed on a substrate. A colored layer containing a polymer and a coloring matter is formed on the electroconductive layer by electrodeposition. The polymer and the coloring matter contained in the colored layer are chemically bonded to each other.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: November 1, 1988
    Assignees: Seiko Instruments & Electronics Ltd., Shinto Paint Co., Ltd.
    Inventors: Mitsuru Suginoya, Koji Iwasa, Hitoshi Kamamori, Yutaka Sano, Yumiko Terada, Naoki Kato, Tameyuki Suzuki, Junichi Yasukawa, Toyokazu Nomura, Kazuo Tohda, Shinji Itoh
  • Patent number: 4670188
    Abstract: An electrically conductive composition for electrodeposition coating comprises (A) a pigment and at least one cationic high molecular resin and (B) electrically conductive ultra-fine particles having an average particle diameter less than 0.8 .mu., the amount of (A) being 96-50% by weight and the amount of (B) being 4-50% by weight of the total solid content of the composition.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: June 2, 1987
    Assignees: Seiko Instruments & Electronics Ltd., Shinto Paint Co., Ltd.
    Inventors: Koji Iwasa, Hitoshi Kamamori, Mitsuru Suginoya, Yutaka Sano, Yumiko Terada, Naoki Kato, Tameyuki Suzuki, Jun-ichi Yasukawa, Toyokazu Nomura, Kazuo Tohda, Shinji Itoh