Patents by Inventor Shizuko Kushida

Shizuko Kushida 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).

  • Pressure-regulating device for use in storage, transportation and disposal of hazardous wastes
    Patent number: 4826035
    Abstract: A pressure-regulating device for impact-resistant containers used for storage, transportation and disposal of hazardous waste materials, is herein disclosed, which comprises a vent fixed to the lid of said container to keep the gaseous phase pressure inside said container at a positive pressure of 50% or less of the pressure resistance of said container, the vent being columnar and made of an alumina-based sintered ceramic and having a porosity of 50% or less, a pore diameter range of 0.4 to 1.4 .mu. and a length (mm)/cross-sectional area (mm.sup.2) ratio of 2 to 10.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: May 2, 1989
    Assignee: Chichibu Cement Co. Ltd.
    Inventors: Osamu Suzuki, Kanjiro Ishizaki, Akira Asami, Shizuko Kushida
  • Concrete structural member and method for manufacture thereof
    Patent number: 4774045
    Abstract: A concrete structural member of improved stability is produced by preparing a concrete composite layer having a concrete layer on one side and an aggregate layer on the other side thereof, impregnating the composite layer with a monomer, thermally or catalytically polymerizing the monomer impregnated in the composite layer, and thereafter placing fresh concrete on the aggregate layer side of the polymer-impregnated composite layer.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: September 27, 1988
    Assignees: Ozawa Concrete Industry Co., Taisei Corporation
    Inventors: Shizuko Kushida, Takashi Tsubahara, Takafumi Naito, Seiji Kaneko, Yasunori Matsuoka, Takefumi Shindo