Patents by Inventor Kyouzi Muraoka

Kyouzi Muraoka 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).

  • Asphalt water-proofing material
    Patent number: 4230762
    Abstract: An asphalt water-proofing material comprising a core impregnated with petroleum asphalt. The core is made of composite material including a non-woven fabric layer formed of long filaments of synthetic resin arranged in random fashion and a woven or knitted fabric layer. The non-woven fabric and woven or knitted fabric layers are connected together by needle-punching whereby the long filaments of the non-woven fabric layer are forced into the woven or knitted fabric layer to integrally connect these layers to form said core.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: October 28, 1980
    Assignees: Mitsui Petrochemical Industries Ltd., Mitsuboshi Sangyo Co., Ltd.
    Inventors: Hajime Iwasaki, Kuninori Mizuta, Yoshinori Kobayashi, Tadayoshi Yoshikawa, Kyouzi Muraoka