Patents by Inventor Sunao Mitsui

Sunao Mitsui 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 production of 1-aryl-5-(trifluoromethyl)-1H-tetrazoles
    Patent number: 7282609
    Abstract: The present invention relates to a process for producing an N-aryl-2,2,2-trifluoroacetimidoyl chloride represented by Formula (2): the process comprising the step of reacting in an organic solvent a tertiary amine, a 2,2,2-trifluoro-N-arylacetamide represented by Formula (1): and at least one member selected from the group consisting of phosphorus oxychloride and diphenyl chlorophosphate; and a process for producing a 1-aryl-5-(trifluoromethyl)-1H-tetrazole represented by Formula (4): the process comprising the step of reacting in an aromatic hydrocarbon solvent, in the presence of an amine salt, an N-aryl-2,2,2-trifluoroacetimidoyl chloride represented by Formula (2) shown above and an azide.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: October 16, 2007
    Assignee: Toyo Kasei Kogyo Company Limited
    Inventors: Kazutake Hagiya, Yasuhiro Sato, Kiyoto Koguro, Sunao Mitsui
  • Process for production of 1-aryl-5-(trifluoromethyl)-1h-tetrazoles
    Publication number: 20070106080
    Abstract: The present invention relates to a process for producing an N-aryl-2,2,2-trifluoroacetimidoyl chloride represented by Formula (2): the process comprising the step of reacting in an organic solvent a tertiary amine, a 2,2,2-trifluoro-N-arylacetamide represented by Formula (1): and at least one member selected from the group consisting of phosphorus oxychloride and diphenyl chlorophosphate; and a process for producing a 1-aryl-5-(trifluoromethyl)-1H-tetrazole represented by Formula (4): the process comprising the step of reacting in an aromatic hydrocarbon solvent, in the presence of an amine salt, an N-aryl-2,2,2-trifluoroacetimidoyl chloride represented by Formula (2) shown above and an azide.
    Type: Application
    Filed: September 30, 2004
    Publication date: May 10, 2007
    Applicant: TOYO KASEI KOGYO COMPANY LIMITED
    Inventors: Kazutake Hagiya, Yasuhiro Sato, Kiyoto Koguro, Sunao Mitsui
  • 2,5-Dimercapto-1,3,4-thiadiazole dilithium salt and its dihydrate and their manufacture, and a secondary lithium battery and positive electrode-active material comprising the same
    Patent number: 6340539
    Abstract: This invention is directed to 2,5-dimercapto-1,3,4-thiadiazole dilithium salt and its dihydrate and methods of their manufacture, and a secondary lithium battery and positive electrode-active material comprising the same.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: January 22, 2002
    Assignee: Toyo Kasei Kogyo Company Limited
    Inventors: Satoshi Yamaguchi, Satoshi Nakagawa, Sunao Mitsui, Susumu Ohno
  • Process for preparation of a 1-(tetrazolylbiphenylmethyl)-imidazole derivative
    Patent number: 6040454
    Abstract: The invention is directed to a process for preparing a 5-substituted tetrazole, the process comprising the step of reacting a nitrile with an inorganic azide salt in an aromatic hydrocarbon solvent in the presence of an amine salt. According to the invention, a 5-substituted tetrazole can be produced in a high yield with ease and safety using inexpensive raw materials while the reaction is easily controlled to inhibit a side reaction.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: March 21, 2000
    Assignee: Toyo Kasei Kogyo Company Limited
    Inventors: Kiyoto Koguro, Toshikazu Oga, Norihito Tokunaga, Sunao Mitsui, Ryozo Orita
  • Process for preparation of 5- substituted tetrazoles
    Patent number: 5744612
    Abstract: The invention is directed to a process for preparing a 5-substituted tetrazole, the process comprising the step of reacting a nitrile with an inorganic azide salt in an aromatic hydrocarbon solvent in the presence of an amine salt. According to the invention, a 5-substituted tetrazole can be produced in a high yield with ease and safety using inexpensive raw materials while the reaction is easily controlled to inhibit a side reaction.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: April 28, 1998
    Assignee: Toyo Kasei Kogyo Company Limited
    Inventors: Kiyoto Koguro, Toshikazu Oga, Norihito Tokunaga, Sunao Mitsui, Ryozo Orita