Patents by Inventor Takafumi Kawada

Takafumi Kawada 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 tertiary butyl hydrazine hydrohalogenide
    Patent number: 5731465
    Abstract: An industrially and economically advantageous process for the preparation of a TBH-HX using starting materials which are cheaply available and are easy to handle, maintaining a high yield. A tertiary butyl hydrazine hydrohalogenide is prepared by reacting a hydrazine hydrohalogenide with a methyl tertiary butyl ether in the presence of an acid.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: March 24, 1998
    Assignee: Japan Hydrazine Co., Ltd.
    Inventors: Yoichi Hasegawa, Mineo Nakagawa, Shunji Hyoda, Hiroyuki Fujita, Takafumi Kawada