Patents by Inventor Hirofumi Katsurayama

Hirofumi Katsurayama 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).

  • Split fibers, integrated split fiber articles and method for preparing the same
    Patent number: 5275884
    Abstract: Bulky split fibers having bond strength are produced by preparing a composite synthetic resin film of three layer structure having a polypropylene layer formed of a polypropylene/polyethylene blend and a polyethylene layer on either surface of the polypropylene layer, slitting and stretching the composite film to thereby form stretched tapes, and causing splitting of the stretched tapes for fibrillation. An integral article is prepared from the resultant split fibers by mixing them alone or with plant fibers and then heating at a temperature between the melting points of polyethylene and polypropylene, thereby integrating together the split fibers with each other or with the plant fibers.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: January 4, 1994
    Assignees: Mitsui Petrochemical Industries, Ltd., Uni Charm Corporation
    Inventors: Kazunari Nishino, Shuzo Sasagawa, Hirofumi Katsurayama, Takamitsu Igaue, Tsutomu Kido
  • Split fibers, integrated split fiber articles and method for preparing the same
    Patent number: 5188895
    Abstract: Bulky split fibers having bond strength are produced by preparing a composite synthetic resin film of three layer structure having a polypropylene layer formed of a polypropylene/polyethylene blend and a polyethylene layer on either surface of the polypropylene layer, slitting and stretching the composite film to thereby form stretched tapes, and causing splitting of the stretched tapes for fibrillation. An integral article is prepared from the resultant split fibers by mixing them alone or with plant fibers and then heating at a temperature between the melting points of polyethylene and polypropylene, thereby integrating together the split fibers with each other or with the plant fibers.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: February 23, 1993
    Assignees: Mitsui Petrochemical Industries, Ltd., Uni Charm Corporation
    Inventors: Kazunari Nishino, Shuzo Sasagawa, Hirofumi Katsurayama, Takamitsu Igaue, Tsutomu Kido