Patents by Inventor Koichiro Jitsukawa

Koichiro Jitsukawa 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).

  • Isocephem derivatives, and antimicrobial composition containing the derivatives
    Patent number: 5262411
    Abstract: There is provided a cephalosporin derivative represented by the general formula (1): ##STR1## wherein R.sup.101, R.sup.102, R.sup.103 and Y.sup.101 are as difined; the general formula (2): ##STR2## wherein R.sup.201, R.sup.202 and R.sup.203 are as defined above; the general formula (3): ##STR3## wherein R.sup.301, R.sup.302, Y.sup.301, Y.sup.302 and A.sup.301 are as defined; or pharmaceutically acceptable salt thereof. The compound is useful as an active ingredient of antimicrobial agent.
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: November 16, 1993
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Tetsuhiko Shirasaka, Hiroshi Ishikawa, Koichi Yasumura, Koichiro Jitsukawa, Sachio Toyama, Hidetsugu Tsubouchi, Kimio Sudo, Koichi Tsuji
  • Pyrroloquinoline derivatives and pharmaceutical compositions for antimicrobial use
    Patent number: 5185337
    Abstract: There is described pyrroloquinoline derivatives of general formula: ##STR1## wherein R' is a C.sub.1 -C.sub.6 alkyl group, R.sup.2 is a group: ##STR2## or group: ##STR3## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are as defined, or salt thereof. These compounds have an antimicrobial activity.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: February 9, 1993
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Setsuro Fujii, deceased, Kaoruko Takada, legal heir, Hiroshi Ishikawa, Hidetsugu Tsubouchi, Koichiro Jitsukawa
  • 2-oxa-isocephem compounds
    Patent number: 5037976
    Abstract: A 2-oxa-isocephem compound of the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined, pharmaceutically acceptable salts thereof, composition containing the same and processes for preparing the same are disclosed. The compound is useful as an antimicrobial agent.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: August 6, 1991
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Setsuro Fujii, Hiroshi Ishikawa, Koichi Yasumura, Koichiro Jitsukawa, Sachio Toyama, Hidetsugu Tsubouchi, Kimio Sudo, Kouichi Tsuji
  • 2-oxa-isocephem compounds, compositions containing the same and processes for preparing the same
    Patent number: 4950662
    Abstract: There is described a 2-oxa-isocephem compound of the formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.4 are as defined, and R.sup.3 is a group of the formula: ##STR2## wherein n, m, R.sup.6, R.sup.7, B.sup.- and l are as defined, or pharmaceutically acceptable salt thereof. The compound has antimicrobial activity.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: August 21, 1990
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Setsuro Fujii, Hiroshi Ishikawa, Koichi Yasumura, Koichiro Jitsukawa, Sachio Toyama, Hidetsugu Tsubouchi, Kimio Sudo, Koichi Tsuji
  • 2-Oxa-isocephem compounds and compositions containing same
    Patent number: 4898859
    Abstract: A 2-oxa-isocephem compound of the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined, pharmaceutically acceptable salts thereof, composition containing the same and processes for preparing the same are disclosed. The compound is useful as an antimicrobial agent.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: February 6, 1990
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Setsuro Fujii, Hiroshi Ishikawa, Koichi Yasumura, Koichiro Jitsukawa, Sachio Toyama, Hidetsugu Tsubouchi, Kimio Sudo, Kouichi Tsuji
  • 2-oxa-isocephem compounds, compositions containing same and processes of using
    Patent number: 4831026
    Abstract: A 2-oxa-isocephem compound of the formula (1): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined, pharmaceutically acceptable salts thereof, esters of the carboxy group in the 4-position thereof and quaternary ammonium salts thereof, composition containing the same and processes for preparing the same are disclosed. The compound is useful as an antimicrobial compound.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: May 16, 1989
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Setsuro Fujii, Hiroshi Ishikawa, Koichi Yasumura, Koichiro Jitsukawa, Sachio Toyama, Hidetsugu Tsubouchi, Kimio Sudo, Kouichi Tsuji