Patents by Inventor Hideki Kuranishi

Hideki Kuranishi 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 preparing N-tert-butyl-2-pyrazinecarboxamide and N-tert-butyl-2-piperazinecarboxamide
    Patent number: 5922873
    Abstract: A process for preparing a N-tert-butyl-2-pyrazinecarboxamide having the formula (2): ##STR1## which comprises reacting a cyanopyrazine having the formula (1): ##STR2## with tert-butyl alcohol in the presence of sulfuric acid and a process for preparing a N-tert-butyl-2-piperazine-carboxamide having the formula (3): ##STR3## which comprises hydrogenating of said N-tert-butyl-2-pyrazinecarboxamide having the formula (2) in the presence of Raney nickel or Raney cobalt.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: July 13, 1999
    Assignee: Koei Chemical Co., Ltd.
    Inventors: Nanao Watanabe, Sadao Asahi, Hideki Kuranishi
  • Process for preparing N-tert-butyl-2-pyrazinecarboxamide and N-tert-butyl-2-piperazinecarboxamide
    Patent number: 5734055
    Abstract: A process for preparing a N-tert-butyl-2-pyrazinecarboxamide having the formula (2): ##STR1## which comprises reacting a cyanopyrazine having the formula (1): ##STR2## with tert-butyl alcohol in the presence of sulfuric acid and a process for preparing a N-tert-butyl-2-piperazine-carboxamide having the formula (3): ##STR3## which comprises hydrogenating of said N-tert-butyl-2-pyrazinecarboxamide having the formula (2) in the presence of Raney nickel or Raney cobalt.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: March 31, 1998
    Assignee: Koei Chemical Co. Ltd.
    Inventors: Nanao Watanabe, Sadao Asahi, Hideki Kuranishi, Takashi Kurahashi
  • Process for preparing tertiary amine-N-oxide
    Patent number: 5668281
    Abstract: A process for preparing a tertiary amine-N-oxide which comprises reacting a tertiary amine with a peroxide in the presence of a catalyst comprising an oxide containing silicon and titanium atoms. According to the process of the present invention, a tertiary amine-N-oxide can be obtained in a high yield, and since the catalyst can easily be separated from the reaction mixture, the tertiary amine-N-oxide can be obtained in a high purity without the contamination by the catalyst.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: September 16, 1997
    Assignee: Koei Chemical Co., Ltd.
    Inventors: Shinkichi Shimizu, Nanao Watanabe, Hideki Kuranishi