Patents by Inventor Kiyokazu Okumoto

Kiyokazu Okumoto 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).

  • Stretched polyethylene filaments of high strength and high modulus, and their production
    Patent number: 4617233
    Abstract: Stretched filaments of high strength and high modulus being made of polyethylene of a weight average molecular weight of not less than 3.times.10.sup.6 and having a strength of not less than 50 g/d and an initial modulus of not less than 1,500 g/d, the long period structure being substantially not observed, which are prepared by spinning a dilute solution of said polyethylene and stretching the resultant gel-like filaments in multi-stages until the long period structure becomes substantially not observed.
    Type: Grant
    Filed: May 21, 1984
    Date of Patent: October 14, 1986
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Toshihiko Ohta, Fujio Okada, Kiyokazu Okumoto