Patents by Inventor Mineo Nakagawa

Mineo Nakagawa 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
  • 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
  • Process for producing inorganic acid salts of tertiary butyl hydrazine
    Patent number: 4310696
    Abstract: Inorganic acid salts of tertiary butyl hydrazine such as hydrochloride or hydrobromide of tertiary butyl hydrazine, useful for production of azine compounds are substantially stoichiometrically produced by reaction of inorganic acid salts of hydrazine such as hydrochloride or hydrobromide of hydrazine with tertiary butyl halides such as chloride or bromide at a molar ratio of the tertiary butyl halides to inorganic acid salts of 1:7-10 at a reaction temperature of 90.degree. to 110.degree. C. for 40 to 100 minutes.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: January 12, 1982
    Assignee: Japan Hydrazine Co., Inc.
    Inventors: Shiro Hojo, Yoichi Hasegawa, Mineo Nakagawa