Patents by Inventor Shuzo Sasagawa

Shuzo Sasagawa 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
  • Obliquely oriented polypropylene cross film and fastening tape for paper diaper comprising said cross film
    Patent number: 5135800
    Abstract: A composition comprising polypropylene and a small amount of polyethylene can be shaped into an obliquely oriented film, and if obliquely oriented films shaped from this composition are laminated so that the molecular orientation directions cross one another, an obliquely oriented cross film having excellent heat resistance and mechanical strength is obtained. This cross film is suitably used as a base of a fastening tape for a paper diaper.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: August 4, 1992
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Haruki Nagaoka, Shuzo Sasagawa, Kazunari Nishino
  • Process for producing synthetic resin laminates
    Patent number: 4102720
    Abstract: A synthetic resin laminate composed of a supporting plate having protrusions and a foamed sheet having fine through-holes and fixed to the protrusions is produced by placing a foamed sheet extruded on the protrusions of a supporting plate heated to a temperature suitable for fusion-fixing and applying a draft to the supporting plate at a speed more than, but not exceeding 5 times the speed of the foamed sheet.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: July 25, 1978
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Takafumi Kaneko, Shuzo Sasagawa, Noriyuki Ishii, Takashi Hiraoka, Shozo Hieda