Patents by Inventor Koiti Ohasi

Koiti Ohasi 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).

  • Conductive paste
    Patent number: 4410457
    Abstract: An electroconductive paste comprising(a) an electroconductive filler,(b) a reactive solvent, and(c) a hardener comprising(c-1) an epoxy resin,(c-2) a latent hardener, and(c-3) an epoxy compound-dialkylamine adduct,the percent by weight of (a), (b) and (c) being 95 to 50, 1 to 20 and 4 to 30, respectively, and the weight ratio of (c-1):(c-2):(c-3) being 100:0 to 30:0.1 to 40. The paste is useful for bonding electronic elements to metal lead frames and/or substrates.
    Type: Grant
    Filed: May 5, 1982
    Date of Patent: October 18, 1983
    Assignees: Sumitomo Chemical Co., Ltd., Sumitomo Metal Mining Company, Ltd.
    Inventors: Kenji Fujimura, Shigeru Sekiya, Kunimasa Kamio, Koichi Okuno, Satoru Haraguchi, Koiti Ohasi, Hiroyuki Yamaguchi
  • Adhesive composition
    Patent number: 4377490
    Abstract: An adhesive composition enhanced in initial adhesion strength which comprises (A) an .alpha.-cyanoacrylate ester, (B) at least one chosen from aliphatic polyols and their derivatives and polyethers and their derivatives and (C) at least one chosen from aromatic polyols and their derivatives and carboxylic acids and their derivatives.
    Type: Grant
    Filed: September 9, 1981
    Date of Patent: March 22, 1983
    Assignees: Sumitomo Chemical Company, Limited, Taoka Chemical Co., Ltd.
    Inventors: Yoshihisa Shiraishi, Kazuhiro Nakagawa, Chiaki Nakata, Koiti Ohasi
  • Adhesive composition
    Patent number: 4307216
    Abstract: An adhesive composition which comprises an .alpha.-cyanoacrylate compound with a certain ester ether compound and, preferably, a polyhydroxybenzoic acid compound. The composition is enhanced in heat shock resistance and improved in initial adhesion rate.
    Type: Grant
    Filed: January 14, 1980
    Date of Patent: December 22, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yoshihisa Shiraishi, Kazuhiro Nakagawa, Chiaki Nakata, Koiti Ohasi