Patents by Inventor Shosuke Nagai

Shosuke Nagai 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).

  • Patent number: 4393000
    Abstract: A process for producing aziridine-2-carboxylic acid or its salts is provided which comprises treating an alpha-halogeno-beta-aminopropionitrile or its mineral acid salt with an alkali or alkaline earth metal hydroxide in water or in a water-containing organic solvent. In a preferred embodiment, aziridine-2-carboxylic acid or its salt is produced by treating the reaction mixture containing an alpha-halogeno-beta-aminopropionitrile obtained by reacting an alpha, beta-dihalogenopropionitrile or an alpha-halogenoacrylonitrile with ammonia, with an alkali or alkaline earth metal hydroxide in the presence of water without isolating the alpha-halogeno-beta-aminopropionitrile from the reaction mixture beforehand.
    Type: Grant
    Filed: December 9, 1980
    Date of Patent: July 12, 1983
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Ryuichi Mita, Chojiro Higuchi, Toshio Kato, Nobuyuki Kawashima, Akihiro Yamaguchi, Shosuke Nagai, Takao Takano
  • Patent number: 4350643
    Abstract: A process for producing a 2,3-dihalopropionitrile is provided which comprises directly halogenating acrylonitrile with a halogenating agent in the presence of a carbonate, hydrogen carbonate or hydrogen phosphate of an alkali or alkaline earth metal and in the absence of positive irradiation of light.
    Type: Grant
    Filed: December 12, 1980
    Date of Patent: September 21, 1982
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shosuke Nagai, Toshio Kato, Chojiro H. Iguchi, Nobuyuki Kawashima, Ryuichi Mita, Akihiro Yamaguchi, Takao Takano
  • Patent number: 4304933
    Abstract: Production of DL-serine by heating a strong acid type cation exchange resin having aziridine-2-carboxylic acid absorbed thereto. Specifically, an industrial process for producing DL-serine is provided which comprises treating an alpha-halogeno-beta-aminopropionitrile or its mineral acid salt in water or a water-containing organic solvent with an alkali or alkaline earth metal hydroxide to form an alkali or alkaline earth metal aziridine-2-carboxylate, treating the reaction mixture with a strong acid type cation exchange resin to cause adsorption of aziridine-2-carboxylic acid, and thereafter heating the cation-exchange resin.
    Type: Grant
    Filed: December 2, 1980
    Date of Patent: December 8, 1981
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Ryuichi Mita, Chojiro Higuchi, Toshio Kato, Nobuyuki Kawashima, Akihiro Yamaguchi, Shosuke Nagai, Takao Takano