Patents by Inventor Tatsuhiko Yanagawa

Tatsuhiko Yanagawa 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 decomposing aromatic acylated compound.HF-BF.sub.3 complex
    Patent number: 4967011
    Abstract: The present invention relates to a process for decomposing an aromatic acylated compound.HF-BF.sub.3 complex in preparing an aromatic acylated compound by decomposing an aromatic acylated compound.HF-BF.sub.3 complex obtained by reacting an aromatic compound with an acylating agent in the presence of HF-BF.sub.3 as a catalyst, which comprises subjecting the aromatic acylated compound.HF-BF.sub.3 complex to thermal decomposition in the presence of at least one aromatic hydrocarbon (A.H.) selected from benzene, toluene and chlorobenzene and at least one saturated aliphatic hydrocarbon (S.H.) selected from pentane, hexane and cyclohexane, as a decomposing agent.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: October 30, 1990
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Nobuyuki Tokura, Tadayoshi Takefumi, Shunichi Matsumoto, Tatsuhiko Yanagawa, Yoshihiro Shiokawa, Ichiyo Ohtsuka