Patents by Inventor Hiroshi Yabuuchi

Hiroshi Yabuuchi 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).

  • Process for preparing alternating copolymer of conjugated vinyl compound and olefinic unsaturated compound with oxygen and boron compound
    Patent number: 4121032
    Abstract: An alternating copolymer of an olefinic unsaturated compound and a conjugated vinyl compound is produced by contacting said monomers with at least one organoboron halide or/and a mixture of at least one organo-compound of metal from Groups IIb, IIIb and IVb of the Mendeleev Periodic Table and at least one halogeno-compound of metal from Groups IIIb and IVb of the Mendeleev Periodic Table. A typical catalyst is ethylboron dichloride or a combination of triethylaluminum and tin tetrachloride.
    Type: Grant
    Filed: April 15, 1975
    Date of Patent: October 17, 1978
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kohei Nakaguchi, Shohachi Kawasumi, Masaaki Hirooka, Hiroshi Yabuuchi, Hiroyoshi Takao
  • Process for preparing an alternating copolymer of a conjugated vinyl compound and an olefinic unsaturated compound
    Patent number: 3989882
    Abstract: An alternating copolymer of an olefinic unsaturated compound and a conjugated vinyl compound is produced by contacting said monomers with at least one organoboron halide or/and a mixture of at least one organo-compound of metal from Groups IIb, IIIb and IVb of the Mendeleev Periodic Table and at least one halogeno-compound of metal from Groups IIIb and IVb of the Mendeleev Periodic Table. A typical catalyst is ethylboron dichloride or a combination of triethylaluminum and tin tetrachloride.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: November 2, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kohei Nakaguchi, Shohachi Kawasumi, Masaaki Hirooka, Hiroshi Yabuuchi, Hiroyoshi Takao