Patents by Inventor Hitoshi Kawato

Hitoshi Kawato 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).

  • Photopolymerizable compositions including squarylium compounds
    Patent number: 6007965
    Abstract: The present invention relates to photopolymerizable compositions comprising an addition-polymerizable compound which has at least one ethylenically unsaturated double bond; a radical-producing agent and a squarylium compound represented by the formula (I): The compositions are highly sensitive to visible and near infrared lights, particularly He-Ne laser, LED, diode laser, etc. having oscillation wavelengths in a wavelength region of 600 nm or more, and thus are useful as materials for holograms, presensitized plate for laser direct process, dry film resists, digital proofs, photosensitive microcapsules.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: December 28, 1999
    Inventors: Tsuguo Yamaoka, Kenichi Koseki, Mitsuharu Obara, Ikuo Shimizu, Yukiyoshi Ito, Hitoshi Kawato
  • Photopolymerizable composition containing an addition polymerizable compound, a radical-producing agent and a squarylium compound
    Patent number: 5756258
    Abstract: The present invention relates to photopolymerizable compositions comprising an addition-polymerizable compound which has at least one ethylenically unsaturated double bond; a radical-producing agent and a squarylium compound represented by the formula (I): ##STR1## The compositions are highly sensitive to visible and near infrared lights, particularly He-Ne laser, LED, diode laser, etc. having oscillation wavelengths in a wavelength region of 600 nm or more, and thus are useful as materials for holograms, presentized plates for laser direct process, dry film resists, digital proofs, photosensitive microcapsules.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: May 26, 1998
    Assignee: Kyowa Hakko Co., Ltd.
    Inventors: Tsuguo Yamaoka, Kenichi Koseki, Mitsuharu Obara, Ikuo Shimizu, Yukiyoshi Ito, Hitoshi Kawato