Patents by Inventor Kenzo Sagawa

Kenzo Sagawa 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).

  • Patent number: 5391682
    Abstract: A thermoplastic polyurethane elastomer containing a very small amount of small grains, and having a high molecular weight and a narrow molecular-weight distribution. Such high-quality thermoplastic polyurethane is excellent in melt moldability and allows to prevent yarn breakage in producing fibers by melt spinning, for example. Such polyurethane elastomer can be produced by melt-polymerizing a prepolymer and a low-molecular diol at a relatively high temperature in a short period of time. This invention also provides an apparatus for producing the polyurethane elastomer, and fibers formed of said elastomer.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: February 21, 1995
    Assignee: Kanebo, Ltd.
    Inventors: Yasuhiro Ogawa, Kenzo Sagawa, Takahiro Kitano, Michiya Yamashita, Tadaaki Yamada, Toshio Yamauchi