Patents by Inventor Yasushi Tsuru

Yasushi Tsuru 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).

  • 1,3,5,7-Naphthalenetetracarboxylic acids and process for preparation thereof
    Patent number: 3954840
    Abstract: A novel 1,3,5,7-naphthalenetetracarboxylic acid, an alkali salt thereof, or an ester thereof, and a novel process for preparation thereof, and method of effective purification thereof.
    Type: Grant
    Filed: February 11, 1974
    Date of Patent: May 4, 1976
    Assignee: Teijin Ltd.
    Inventors: Gentaro Yamashita, Yasushi Tsuru, Kiyoshi Yamamoto, Moriharu Yamamoto, Nobuo Sakaiya, Toshihiro Aoyama, Tadao Komoriya