Patents by Inventor Michio Takigawa

Michio Takigawa 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 producing halogenated sulfone
    Patent number: 4947001
    Abstract: The present invention provides a process for preparing halogenated sulfones by reacting a halogenating agent with a salt of a hydroxysulfone. The halogenated sulfones are useful as an intermediate for vitamin A or its carboxylic acid esters employed as medicines or feed additives.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: August 7, 1990
    Assignee: Kuraray Company, Ltd.
    Inventors: Takashi Onishi, Toshiki Mori, Shigeaki Suzuki, Michio Takigawa, Kazuo Yamamoto