Patents by Inventor Kouichi Wakabayashi

Kouichi Wakabayashi 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).

  • Apparatus for the production of foamed polyolefin sheets
    Patent number: 5281119
    Abstract: An apparatus for the formation of a foamed polyolefin sheet provided with a cylindrical cooling device for cooling a foamed extruded tubular body at one end of an extruder, air outlets for increasing the internal pressure of the cooled foamed tubular body at a region between the extruder die and the upstream section of a cylindrical cooling device and between at least two adjacent sections of a cylindrical cooling device and a cutting blade for slitting the foamed tubular body enables the production of foamed polyolefin sheets with improved surface characteristics and strength.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: January 25, 1994
    Assignee: Japan Styrene Paper Corporation
    Inventors: Shoji Iwano, Kouichi Wakabayashi, Yoshihisa Ishihara
  • Process for the production of foamed polyolefin sheets
    Patent number: 5281377
    Abstract: A foamed polyolefin sheet is formed by extruding a molten polyolefin resin, which contains a blowing agent, into a low-pressure zone through an annular die provided at an end of the extruder to form a foamed tubular body, bringing the foamed tubular body into contact with a peripheral surface of a cylindrical cooling device to cool the foamed tubular body and then slitting the thus-cooled foamed tubular body and then slitting the thus-cooled foamed tubular body in the direction of extrusion to open same. The cylindrical cooling device is divided into an upstream section and at least one other spaced downstream sections. The internal pressure of the foamed tubular body is increased to from about 5.times.10.sup.-4 to 3.times.10.sup.-2 kg/cm.sup.2 (G) between the die and the upstream section of the cylindrical cooling device and also between at least two adjacent sections of the cylindrical cooling device to apply tension to the foamed tubular body at the inner wall and prevent the formation of corrugations.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: January 25, 1994
    Assignee: Japan Styrene Paper Corporation
    Inventors: Shoji Iwano, Kouichi Wakabayashi, Yoshihisa Ishihara
  • Process for producing a foamed base material for car ceiling member
    Patent number: 4810316
    Abstract: A thermoplastic resin having a Vicat softening point of 115.degree. C. or higher and containing a blowing agent is extruded and foamed into a foamed tubular body. The foamed tubular body is subjected to biaxial orientation and then pressed in antipodal directions, whereby the foamed tubular body is flattened and fusion-bonded at the resultant mutually-opposing inner walls thereof to obtain a foamed base material suitable for use in the fabrication of a car ceiling member. The foamed base material has not only excellent mechanical strength but also superb thermal strength. The foamed base material is not required to laminate films, sheets or the like thereon and is hence provided at a low cost.
    Type: Grant
    Filed: September 1, 1987
    Date of Patent: March 7, 1989
    Assignee: Japan Styrene Paper Corp.
    Inventors: Kouichi Wakabayashi, Nobuyoshi Shimayashiki, Akira Adachi