Patents by Inventor Yasuhisa Kishimoto

Yasuhisa Kishimoto 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 vinyl polymer
    Patent number: 6291612
    Abstract: A vinyl polymer having a controlled molecular weight and narrow molecular weight distribution is prepared by polymerizing a vinyl monomer using an organic halide polymerization initiator in the presence of a cuprous compound catalyst in a solvent containing an organic compound having a dielectric constant of at least 10 at 25° C., or by polymerizing a vinyl monomer using an organic halide polymerization initiator in the presence of a cuprous compound catalyst and also a specific 1,10-phenanthroline compound.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: September 18, 2001
    Assignee: Kaneko Corporation
    Inventors: Yasuhisa Kishimoto, Masato Kusakabe