Patents Assigned to Japan Hydrazine Co., Inc.
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Patent number: 6156906Abstract: A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by dropwisely adding the aqueous hydrogen peroxide to which a small amount of weakly acidic substance has been added, to a starting aqueous solution containing hydrogen cyanide or sodium cyanide or potassium cyanide, sodium azide and a catalytic amount of copper sulfate preferably at a low temperature to maintain the pH of the reaction solution over a range of from 5 to 6, heating the reaction solution to effect the oxidation and cyclization reaction, reacting the reaction product with ammonium chloride or an aqueous solution thereof, and recovering the formed ammonium salt in the form of sparingly soluble crystals. The desired product is obtained in a high yield and in a high purity from the starting materials which are cheaply available and are easy to handle through a decreased number of steps, i.e., through a one-pot reaction without requiring cumbersome after-treatment.Type: GrantFiled: August 16, 1999Date of Patent: December 5, 2000Assignees: Japan Hydrazine Co., Inc., Masuda Chemical Industry Co., LTD.Inventors: Shunji Hyoda, Masaharu Kita, Hirotoshi Sawada, Shuichi Nemugaki, Takahiro Ueta, Kohki Satoh, Sumio Otsuka, Yoshitaka Miyawaki, Hiroshi Taniguchi
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Patent number: 6040453Abstract: A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by using dicyan, sodium azide, ammonium chloride and water as a reaction medium. This process is industrially advantageous since the 5,5'-bi-1H-tetrazole diammonium salt is synthesized and, then, the precipitated crystals thereof are simply isolated by filtration to obtain the 5,5'-bi-1H-tetrazole diammonium salt maintaining an yield which is not lower than 90%. The 5,5'-bi-1H-tetrazole diammonium salt is a gas-generating agent for air bags, which is lowly toxic and is easy to handle.Type: GrantFiled: August 16, 1999Date of Patent: March 21, 2000Assignees: Japan Hydrazine Co., Inc, Masuda Chemical Industry Co., Ltd.Inventors: Shunji Hyoda, Masaharu Kita, Hirotoshi Sawada, Shuichi Nemugaki, Sumio Otsuka, Yoshitaka Miyawaki, Takashi Ogawa, Yuhki Kubo
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Patent number: 4855501Abstract: Disclosed is a process for the preparation of monomethylhydrazine which comprises reacting hydrazine monohydrochloride with methanol in the presence of hydrazine dihydrochloride or methyl chloride and recovering free monomethylhydrazine from the formed monomethylhydrazine hydrochloride.According to this process, monomethylhydrazine can be prepared at a high selectivity very easily while controlling formation of by-products.Type: GrantFiled: December 3, 1981Date of Patent: August 8, 1989Assignee: Japan Hydrazine Co., Inc.Inventors: Shiro Hojo, Yoichi Hasegawa, Takeo Hirai
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Patent number: 4435600Abstract: 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: GrantFiled: March 10, 1983Date of Patent: March 6, 1984Assignee: Japan Hydrazine Co., Inc.Inventors: Yoichi Hasegawa, Mineo Nakagawa, Syuji Hara
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Patent number: 4310696Abstract: 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: GrantFiled: June 30, 1980Date of Patent: January 12, 1982Assignee: Japan Hydrazine Co., Inc.Inventors: Shiro Hojo, Yoichi Hasegawa, Mineo Nakagawa
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Patent number: 4281198Abstract: Methylhydrazines are produced in high yield by reaction of trimethylanilinium halide with hydrazine or monomethylhydrazine at a reaction temperature of 80.degree. to 130.degree. C. for at least 3 hours.Methylhydrazines are useful compounds in the fields of chemical industry, such as manufacturing pharmaceuticals or agricultural chemicals, and space weapon industry.Type: GrantFiled: July 10, 1980Date of Patent: July 28, 1981Assignee: Japan Hydrazine Co., Inc.Inventors: Shiro Hojo, Yoichi Hasegawa, Tuyoshi Ichimiya, Kazuo Kimura
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Patent number: 4150966Abstract: Tobacco yield is increased by spraying the plants after topping with an effective amount of an aqueous solution of the choline salt of maleic hydrazide.Type: GrantFiled: March 14, 1977Date of Patent: April 24, 1979Assignees: Mitsubishi Gas Chemical Company, Inc., Japan Hydrazine Co., Inc.Inventors: Hideshi Tsuchiya, Tetsuo Takamatsu, Masakazu Furushima, Shiro Hojo