Patents by Inventor Sakae Kajihara

Sakae Kajihara 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 preparation of 3-piperazinylbenzisothiazoles
    Patent number: 5939548
    Abstract: There is disclosed a process for preparing 3-piperazinylbenzisothiazoles comprising reacting the specified 3-halo-1,2-benzisothiazole or 2-cyanobenzenesulfenyl halide in the presence of an alkylene glycol derivative. The process is industrially effective, easy and economical and can provide useful intermediates for production of pharmaceutical preparations.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: August 17, 1999
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Hiroshi Goda, Junichi Sakamoto, Shigeki Sakaue, Sakae Kajihara, Miki Todo
  • Process for preparation of 3 piperazinylbenzisothiazoles
    Patent number: 5861511
    Abstract: There is disclosed a process for preparing 3-piperazinylbenzisothiazoles comprising reacting the specified 3-halo-1,2-benzisothiazole or 2-cyanobenzenesulfenyl halide in the presence of an alkylene glycol derivative. The process is industrially effective, easy and economical and can provide useful intermediates for production of pharmaceutical preparations.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: January 19, 1999
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Hiroshi Goda, Junichi Sakamoto, Shigeki Sakaue, Sakae Kajihara, Miki Todo
  • Cyanobenzenesulfenyl halide and process for preparation of 3-substituted benzisothiazole using the same
    Patent number: 5756806
    Abstract: The present invention provides a compound represented by the general formula (I): ##STR1## wherein X represents Cl or Br, a process for preparation of the same and a process for preparation of 3-substituted benzisothiazole by reaction of the compound (I) with a piperazine compound.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: May 26, 1998
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Hiroshi Goda, Junichi Sakamoto, Shigeki Sakaue, Sakae Kajihara, Miki Todo
  • Cyanobenzenesulfenyl halide and process for preparation of 3-substituted benzisothiazole using the same
    Patent number: 5679827
    Abstract: The present invention provides a compound represented by the general formula (I): ##STR1## wherein X represents Cl or Br, a process for preparation of the same and a process for preparation of 3-substituted benzisothiazole by reaction of the compound (I) with a piperazine compound.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: October 21, 1997
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Hiroshi Goda, Junichi Sakamoto, Shigeki Sakaue, Sakae Kajihara, Miki Todo