Patents by Inventor Zenji Izumi

Zenji Izumi 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).

  • Method for producing thermoplastic resin molded articles
    Patent number: 4332767
    Abstract: A method for producing thermoplastic resin molded articles is disclosed. The method comprises heating a sheet comprising a crystalline thermoplastic resin, which is crosslinked to a degree of more than about 5%, to a temperature that is higher than the melting point of the crosslinked resin but below the decomposition temperature thereof. The thus pre-heated sheet is press-molded under a pressure of about 50-1,000 kg/cm.sup.2 by a pair of press mold dies, which are maintained at a temperature below the melting point of the crosslinked resin.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: June 1, 1982
    Assignee: Toray Industries, Inc.
    Inventors: Minoru Kitanaka, Zenji Izumi
  • Multi-component fiber, the method for making said and polyurethane matrix sheets formed from said
    Patent number: 4008344
    Abstract: A multi-component thermoplastic fiber comprising a specified component of a copolymer of the vinyl series, and having very excellent drawability at a low temperature and excellent dimensional stability and a method of obtaining said product.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: February 15, 1977
    Assignee: Toray Industries, Inc.
    Inventors: Miyoshi Okamoto, Koji Watanabe, Zenji Izumi, Toshihiko Aya, Hideaki Kitagawa