Patents by Inventor Kazuhumi Yokoyama

Kazuhumi Yokoyama 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).

  • Patent number: 4830916
    Abstract: A method of manufacturing molded products (or foamed and molded asphalt/urethane foam products) most suitable for sound-proof, vibration control and sealing members which are applied to the floor panel, dashboard and the like in a car, for example, and more particularly, a method of manufacturing foamed and molded asphalt/urethane products comprising introducing polyalkylene polyol having at least two or more hydroxyls in a molecule and polyisocyanate having two or more isocyanate radicals into a mold together with a catalyst and a foaming agent, and reacting them in it, wherein said polyalkylene polyol includes asphalt previously emulsified and dispersed therein; and a laminated structure including a layer of foamed asphalt/urethane foam made according to the method.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: May 16, 1989
    Assignee: Bridgestone Corporation
    Inventors: Hiroya Fukuda, Hitoshi Yaguchi, Kazuhumi Yokoyama, Keiichiro Tabata, Takashi Ohashi