Patents by Inventor Kazumi Tsujimoto

Kazumi Tsujimoto 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).

  • Catalyst for producing 1,4-naphthoquinone
    Patent number: 4840932
    Abstract: A process for producing 1,4-naphthoquinone by oxidizing naphthalene with molecular oxygen in a vapor phase in the presence of a catalyst. The catalyst is made of a mixture of a carrier and fusible catalytic components including vanadium oxide and alkali metal sulfate and pyrosulfate, and has a molded configuration having one or more through-holes.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: June 20, 1989
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Ryo Matsuura, Shigeyuki Yoshimura, Yasuo Asanuma, Katsuaki Nasu, Haruo Yoshizumi, Kazumi Tsujimoto, Toshiyuki Kimura