Patents by Inventor Yozo Todo

Yozo Todo 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).

  • Quinolonecarboxylic acid derivatives or salts thereof
    Patent number: 6025370
    Abstract: The present invention relates to a quinolone-carboxylic acid derivative represented by the general formula [1], or its salt: ##STR1## Of the compounds of the present invention, preferable are compounds in which R.sup.2 represents a substituted or unsubstituted cycloalkyl group; R.sup.3 represents at least one member selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted lower alkyl or lower alkoxy group, and a protected or unprotected hydroxyl or amino group; R.sup.4 represents a hydrogen atom or a substituted or unsubstituted lower alkyl group; each of R.sup.5 and R.sup.6 represents a hydrogen atom; and A represents C--Y in which Y represents a halogen atom, a lower alkyl or lower alkoxy group which may be substituted by one or more halogen atoms, or a protected or unprotected hydroxyl group.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: February 15, 2000
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Yozo Todo, Kazuya Hayashi, Masahiro Takahata, Yasuo Watanabe, Hirokazu Narita
  • Quinolone- or naphthylidone-carboxylic acid derivates or their salts
    Patent number: 5935952
    Abstract: This invention relates to a novel quinolone- or naphthyridone-carboxylic acid derivative or its salt useful as an antibacterial agent, said derivative has a substituent represented by the following formula at the 7 position: ##STR1## wherein preferably R.sup.3 represents at least one member selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted lower alkyl, lower alkoxy or lower alkylthio group, a nitro group, a cyano group, a protected or unprotected hydroxyl group and a protected or unprotected amino group; R.sup.4 represents a hydrogen atom, a substituted or unsubstituted lower alkyl group, a lower alkylidene group and a group forming a cycloalkane ring together with the carbon atom to which R.sup.4 is bonded; and R.sup.5 represents a hydrogen atom or a substituted or unsubstituted lower alkyl or cycloalkyl group.
    Type: Grant
    Filed: February 12, 1997
    Date of Patent: August 10, 1999
    Assignee: Toyama Chemical Co., LTD.
    Inventors: Yozo Todo, Kazuya Hayashi, Masahiro Tadahata, Yasuo Watanabe, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof, process for producing the same, and cerebral function-improving agent comprising the same
    Patent number: 5872117
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function-improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: February 16, 1999
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof, process for producing the same, and cerebral function-improving agent comprising the same
    Patent number: 5719150
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function-improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: February 17, 1998
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof and cerebral function-improving agent comprising the same
    Patent number: 5658904
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function-improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: August 19, 1997
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof process for producing the same, and cerebral function-improving agent comprising the same
    Patent number: 5612381
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function-improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 18, 1997
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof and cerebral function-improving agent comprising the same
    Patent number: 5472984
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function-improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: December 5, 1995
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • 1,2-ethanediol derivative and salt thereof, process for producing the same, and cerebral function-improving agent comprising the same
    Patent number: 5280032
    Abstract: This invention relates to a 1,2-ethanediol derivative and a salt thereof, a process for producing the same, and a cerebral function improving agent comprising the same. The cerebral function-improving agent of this invention is useful for treating cerebrovascular dementia, senile dementia, Alzheimer's dementia, sequelae of ischemic encephalopathy and cerebral apoplexy.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: January 18, 1994
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Satoshi Ono, Tetsuo Yamafuji, Hisaaki Chaki, Mutsuko Maekawa, Yozo Todo, Hirokazu Narita
  • Pyridone carboxylic acid derivatives and salts thereof, process for producing the same and antibacterial agents comprising the same
    Patent number: 4990508
    Abstract: This invention relates to a novel pyridone carboxylic acid derivative having a substituted or unsubstituted cyclopropyl group at the 10-position of pyridobenzoxazine, pyridobenzothiazine or pyridoquinoxaline and a salt thereof, a process for the production thereof and an antibacterial agent comprising the same.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: February 5, 1991
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Hirokazu Narita, Yozo Todo, Jun Nitta, Hiroyasu Takagi, Fumihiko Iino, Mikako Miyajima, Yoshikazu Fukuoka, Isamu Saikawa
  • Nicotinic acid derivatives
    Patent number: 4851535
    Abstract: This invention relates to a process for industrially producing a 1-substituted aryl-1,4-dihydro-4-oxonaphthyridine derivative and a salt thereof which are useful as an antibacterial agent, and also to intermediates therefor and processes for producing the intermediates.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: July 25, 1989
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Yozo Todo, Tetsuo Yamafuji, Katsuyuki Nagumo, Isao Kitayama, Hideyoshi Nagaki, Mikako Miyajima, Yoshinori Konishi, Hirokazu Narita, Shuntaro Takano, Isamu Saikawa
  • Process for producing 1-substituted aryl-1,4-dihydro-4-oxonaphthyridine derivatives, and processes for producing the intermediates
    Patent number: 4704459
    Abstract: This invention relates to a process for industrially producing a 1-substituted aryl-1,4-dihydro-4-oxonaphthyridine derivative and a salt thereof which are useful as an antibacterial agent, and also to intermediates therefor and processes for producing the intermediates.
    Type: Grant
    Filed: January 17, 1986
    Date of Patent: November 3, 1987
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Yozo Todo, Tetsuo Yamafuji, Katsuyuki Nagumo, Isao Kitayama, Hideyoshi Nagaki, Mikako Miyajima, Yoshinori Konishi, Hirokazu Narita, Shuntaro Takano, Isamu Saikawa