Patents by Inventor Shiro Hojo

Shiro Hojo 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 monomethylhydrazine
    Patent number: 4855501
    Abstract: 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: Grant
    Filed: December 3, 1981
    Date of Patent: August 8, 1989
    Assignee: Japan Hydrazine Co., Inc.
    Inventors: Shiro Hojo, Yoichi Hasegawa, Takeo Hirai
  • Plant growth regulator composition
    Patent number: 4732605
    Abstract: A novel plant growth regulator composition comprises a salt of 1,2-dihydropyridazine-3,6-dione and an ammonium alkylsulfate as an adjuvant at a molar ratio of 1/0.02 to 1/0.5.The above composition has remarkable supressing actions for sucker growth, sprouting and twing growth, and allows only a very small amount of hydrazine formation during a long preservation term. The composition can thus be safely applied to edible plants.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: March 22, 1988
    Assignees: Kao Corporation, Japan Hydrazine Company, Inc.
    Inventors: Shiro Hojo, Eiichi Kimura, Tetsuji Iwasaki
  • Plant growth inhibiting composition
    Patent number: 4369057
    Abstract: A plant growth regulating composition comprising the choline salt of 6-hydroxy-3(2H)-pyridazinone and, as adjuvants, a polyoxyethylene oleyl ether and a triethanolamine alkyl-sulfate. The composition according to this invention can be prepared at a lower production cost and is easy to apply. When applied, it exhibits low toxity, and good penetration and transferability.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: January 18, 1983
    Assignees: Kao Soap Co., Ltd., Japan Hydrazine Company, Inc.
    Inventors: Tsuneyuki Takeno, Tetsuji Iwasaki, Shiro Hojo, Eiichi Kimura
  • 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
  • Process for producing methylhydrazines
    Patent number: 4281198
    Abstract: 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: Grant
    Filed: July 10, 1980
    Date of Patent: July 28, 1981
    Assignee: Japan Hydrazine Co., Inc.
    Inventors: Shiro Hojo, Yoichi Hasegawa, Tuyoshi Ichimiya, Kazuo Kimura
  • Method for cultivation of tobacco plants
    Patent number: 4150966
    Abstract: 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: Grant
    Filed: March 14, 1977
    Date of Patent: April 24, 1979
    Assignees: Mitsubishi Gas Chemical Company, Inc., Japan Hydrazine Co., Inc.
    Inventors: Hideshi Tsuchiya, Tetsuo Takamatsu, Masakazu Furushima, Shiro Hojo