Patents by Inventor Hisanobu Niwata

Hisanobu Niwata 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).

  • Cushion or trackbed material for use in riding-ground
    Patent number: 5262453
    Abstract: A cushion or trackbed material for use in a riding-ground is obtained by coating sand with a carboxyl-containing olefin polymer and an oxygen-containing wax.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: November 16, 1993
    Assignees: Nippon Oil Company, Limited, Nippon Petrochemicals Company, Limited, Nippon Hodo Company, Limited
    Inventors: Yutaka Watanabe, Kazuo Aoyama, Hisanobu Niwata, Sumio Ikeda, Katuaki Ishikawa, Yoshiteru Kato