Patents by Inventor Yutaka Okawa

Yutaka Okawa 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).

  • Process for the production of 1,5-naphtylenediisocyanate
    Patent number: 6222065
    Abstract: 1,5-naphthylenediisocyanate is industrially advantageously produced at high yields by pyrolyzing methyl 1,5-naphthylenecarbamate synthesized by providing 1,5-naphthylenedinitrile as a raw material and carrying out amidation, chlorination and Hofmann rearrangement.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: April 24, 2001
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Yutaka Okawa, Tomoo Tsujimoto, Yutaka Kanbara, Hiroshi Matsunaga