Patents by Inventor Kotaroh Kishimura

Kotaroh Kishimura 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 producing cycloolefin random copolymer
    Patent number: 4935475
    Abstract: A process for producing a cycloolefin random copolymer, which comprises(1) copolymerizing (a) ethylene or both ethylene and an alpha-olefin having at least 3 carbon atoms with (b) a cycloolefin such as octahydronaphthalenes and bicyclo[2,2,1]hept-2-ene in the presence of (c) a catalyst formed from a soluble vanadium compound and an organoaluminum compound at least one of which has halogen, in (d) a liquid phase composed of a hydrocarbon medium to form a solution of a cycloolefin random copolymer, and(2) contacting the resulting copolymer solution with (e) an adsorbent containing a metal cation.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: June 19, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Kotaroh Kishimura, Hideaki Yamaguchi, Syuji Minami
  • Process for producing cycloolefin random copolymer
    Patent number: RE36406
    Abstract: A process for producing a cycloolefin random copolymer, which comprises(1) copolymerizing (a) ethylene or both ethylene and an alpha-olefin having at least 3 carbon atoms with (b) a cycloolefin such as octahydronaphthalenes and bicyclo[2,2,1]hept-2-ene in the presence of (c) a catalyst formed from a soluble vanadium compound and an organoaluminum compound at least one of which has halogen, in (d) a liquid phase composed of a hydrocarbon medium to form a solution of a cycloolefin random copolymer, and(2) contacting the resulting copolymer solution with (e) an adsorbent containing a metal cation.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: November 23, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Kotaroh Kishimura, Hideaki Yamaguchi, Syuji Minami