Patents by Inventor Kiyosumi Watariguchi

Kiyosumi Watariguchi 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 ink compositions
    Patent number: 4271258
    Abstract: A photopolymerizable ink composition containing as essential ingredients (A) a high molecular diacrylate of epoxy resin made of bisphenol A and epichlorohydrin, (B) a urethane modified acrylate resin, (C) a urethane bond-free bifunctional photopolymerizable methacrylate monomer or oligomer, (D) a urethane bond-free polyfunctional photopolymerizable acrylate monomer or oligomer and (E) a photo-initiator, is curable upon short time exposure to ultra-violet irradiation and possesses the electrical, mechanical and chemical properties indispensable to a protective film for use in printed circuit boards.
    Type: Grant
    Filed: July 22, 1980
    Date of Patent: June 2, 1981
    Assignee: Tamura Kaken Co., Ltd.
    Inventor: Kiyosumi Watariguchi