Patents by Inventor Shigeya Yamasaki

Shigeya Yamasaki 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).

  • Method for producing camphorsultam
    Patent number: 6441187
    Abstract: A method for producing camphorsultam, which includes the following steps 1 to 4: Step 1: reacting camphorsulfonic acid with a halogenation agent to give camphorsulfonyl halide, Step 2: reacting the camphorsulfonyl halide with ammonia to give camphorsulfonamide, Step 3: subjecting the camphorsulfonamide to dehydration and ring closure to give camphorsulfonimine, and Step 4: reducing the camphorsulfonimine with sodium borohydride in an aqueous isopropanol solution. According to this invention, camphorsultam and intermediates thereof can be obtained by an industrial method which is comparatively safe to the environment and human body, economical, and which is simple and easy.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: August 27, 2002
    Assignees: Sumika Fine Chemicals Co., Ltd., Ono Pharmaceuticals Co., Ltd.
    Inventors: Hiroshi Shiratani, Shigeya Yamasaki
  • Method for producing camphorsultam
    Publication number: 20020091267
    Abstract: A method for producing camphorsultam, which includes the following steps 1 to 4:
    Type: Application
    Filed: July 9, 2001
    Publication date: July 11, 2002
    Inventors: Hiroshi Shiratani, Shigeya Yamasaki