Patents by Inventor Kenji Nishiwaki

Kenji Nishiwaki 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 producing 2-amino-6-iodopurine
    Patent number: 5994541
    Abstract: The process for preparing 2-amino-6-iodopurine including the steps of suspending at least one chloropurine compound selected from 2-formylamino-6-chloropurine, 2-formylamino-6-chloropurine acetate and 2-amino-6-chloropurine in a solution comprising aqueous hydriodic acid and an alkyl ketone having 3 to 7 carbon atoms; and stirring the resulting suspension at 0.degree. to 50.degree. C. According to the process of the present invention, 2-amino-6-iodopurine can be simply, industrially, and advantageously prepared.
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: November 30, 1999
    Assignee: Sumika Fine Chemicals Co., Ltd.
    Inventors: Taketo Hayashi, Kenji Nishiwaki, Masaaki Kuwata
  • Video tape recorder
    Patent number: D416553
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: November 16, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Nishiwaki, Noriyuki Shinohara
  • Video tape recorder
    Patent number: D428865
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: August 1, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Nishiwaki, Masami Takahashi
  • Video tape recorder
    Patent number: D430123
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: August 29, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Noriyuki Shinohara, Kenji Nishiwaki