Patents by Inventor Yutaka Ohnuki

Yutaka Ohnuki 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 preparation of terpenes
    Patent number: 5073659
    Abstract: A terpene compound having the formula (III) is produced by reacting an allylic halide having the formula (I) with a Grignard reagent having the formula (II) in the presence of anhydrous zinc chloride and a copper compound or an organic zinc halide compound having the formula (IV) in the presence of a copper compound, provided that when A-A is C-C, R' is hydrogen and when A-A is C=C, X is chlorine.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: December 17, 1991
    Assignee: Eisai Co., Ltd.
    Inventors: Kichisaburo Hamamura, Yutaka Ohnuki, Yukio Narabe, Yoshihiro Hisatake, Takashi Banba, Shizumasa Kijima