Patents by Inventor Noritaka Chida

Noritaka Chida 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).

  • Patent number: 4996314
    Abstract: A compound represented by the formula ##STR1## wherein R.sub.1 represents a lower alkyl group or a lower haloalkyl group; R.sub.2 represents a lower alkyl group, a lower haloalkyl group, an aralkyl group, or a group of the formula --COOR.sub.4 or --SO.sub.2 R.sub.5 in which R.sub.4 represents an aralkyl group or a substituted or unsubstituted alkyl group and R.sub.5 represents an alkyl group or a substituted or unsubstituted aryl group; and R.sub.3 represents a hydrogen atom or a carboxyl protecting group which can be easily split off. This compound is useful in the production of a 6-(disubstituted amino)carbapenem-series antibiotic.The compounds of the formula ##STR2## wherein R.sub.1 and R.sub.2 are as defined above are important intermediates for the synthesis of the compounds of formula (I) and/or the aforesaid di-(substituted amino) carbapenem-series antibiotics.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: February 26, 1991
    Assignee: Sanraku Incorporated
    Inventors: Takeo Yoshioka, Noritaka Chida, Azuma Watanabe, Yasuo Fukagawa, Tomoyuki Ishikura
  • Patent number: 4812563
    Abstract: A compound represented by the formula ##STR1## wherein R.sub.1 represents a lower alkyl group or a lower haloalkyl group; R.sub.2 represents a lower alkyl group, a lower haloalkyl group, an aralkyl group, or a group of the formula --COOR.sub.4 or --SO.sub.2 R.sub.5 in which R.sub.4 represents an alkyl group or a substituted or unsubstituted aralkyl group and R.sub.5 represents an alkyl group or a substituted or unsubstituted aryl group; and R.sub.3 represents a hydrogen atom or a carboxyl protecting group which can be easily split off. This compound is useful in the production of a 6-(disubstituted amino)carbapenem-series antibiotic.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: March 14, 1989
    Assignee: Sanraku Incorporated
    Inventors: Takeo Yoshioka, Noritaka Chida, Azuma Watanabe, Yasuo Fukagawa, Tomoyuki Ishikura
  • Patent number: 4778883
    Abstract: An azetidinone derivative of the formula ##STR1## wherein R.sub.1 represents a formyl group, a carboxyl group, an acetyloxy group or a group of the formula ##STR2## in which R.sub.2 and R.sub.3 each represent a lower alkyl group or together represent a lower alkylene group, and Z represents a hydrogen atom or an amino-protecting group.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: October 18, 1988
    Assignee: Sanraku Incorporated
    Inventors: Takeo Yoshioka, Noritaka Chida, Azuma Watanabe, Yasuo Fukagawa, Tomoyuki Ishikura