Patents by Inventor Hideo Ohkawa

Hideo Ohkawa 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).

  • Lightweight construction materials and articles made thereof
    Patent number: 3940811
    Abstract: Lightweight construction materials having a low heat shrinking percentage and a high moisture permeability obtained by forming complementary concavoconvex patterns by means of press molding on both surfaces of a sheet of a foamed polyethylene type resin containing a relatively large amount of inorganic calcic filler, cushion made of said construction materials and mattress manufactured by laminating sheets of soft polyurethane foam on the lightweight construction material as core and covering the whole with cloth.
    Type: Grant
    Filed: July 16, 1973
    Date of Patent: March 2, 1976
    Assignee: Idemitsu, Kosan Kabushiki-Kaisha (Idemitsu Kosan Co., Ltd.)
    Inventors: Masami Tomikawa, Hiroyuki Ishitobi, Hideo Ohkawa