Patents by Inventor Norihiro Sekizuka

Norihiro Sekizuka 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).

  • Vibration-damping composite metal plate
    Patent number: 4740427
    Abstract: A vibration-damping resin composition of the invention comprises 10 to 95% by weight of an amorphous thermoplastic resin polymer (a) and 90 to 5% by weight of a crystalline thermoplastic polymer (b) incompatible with the polymer (a). The polymer (a) has a glass transition temperature lower than that of the polymer (b) and a maximum tan.delta. of 0.5 or more within a predetermined temperature and frequency range. The polymer (b) has a melting point higher than the glass transition temperature of the polymer (a) and a shear storage modulus of 1.times.10.sup.8 dyne/cm.sup.2 or more at the temperature and frequency at which the polymer (a) exhibits the maximum tan.delta..
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: April 26, 1988
    Assignees: Nippon Kokan Kabushiki Kaisha, Mitsubishi Petrochemical Company Limited
    Inventors: Masahide Ochiumi, Shinji Horie, Yukichi Watanabe, Norihiro Sekizuka, Akira Itsubo