Patents by Inventor Keigi Koyama

Keigi Koyama 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).

  • Aqueous preparation containing vitamin E and saponins
    Patent number: 4568667
    Abstract: An aqueous preparation containing vitamin E prepared by emulsifying or solubilizing vitamin E in an aqueous phase in the presence of a saponin shows excellent transparency and thermal stability, and can be widely used in the fields of medicines, cosmetics, foodstuffs, animal feeds and the like. Quillaiasaponin is the preferred saponin.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: February 4, 1986
    Assignees: Eisai Company, Ltd., Asahi Denka Kogyo Kabushiki Kaisha
    Inventors: Yoichi Shirakawa, Makoto Itoh, Keigi Koyama, Yoshio Minowa