Patents by Inventor Syuji Hara

Syuji Hara 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 preparation of tertiary butyl hydrazine
    Patent number: 4435600
    Abstract: Disclosed is a process for the preparation of a tertiary butyl hydrazine hydrohalogenide, which comprises reacting a hydrazine salt of a hydrohalogenic acid with tertiary butanol in the presence of a hydrazine dihydrohalogenide or a hydrogen halide.Also disclosed is a process for the preparation of tertiary butyl hydrazine, which comprises reacting a hydrazine salt of a hydrohalogenic acid in the presence of a hydrazine dihydrohalogenide or a hydrogen halide, neutralizing the formed tertiary butyl hydrazine hydrohalogenide by an alkali, distilling the neutralization product and recovering free tertiary butyl hydrazine.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: March 6, 1984
    Assignee: Japan Hydrazine Co., Inc.
    Inventors: Yoichi Hasegawa, Mineo Nakagawa, Syuji Hara