Patents by Inventor Ryoichi Miyata

Ryoichi Miyata 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 producing azetidinone derivatives
    Patent number: 5149802
    Abstract: A process for producing 2-azetidinone derivatives represented by formula ##STR1## wherein R.sup.1 denotes a protecting group of a hydroxyl group,Z denotes a hydrogen atom or a protecting group of an amino group, andQ denotes ##STR2## in which X denotes a halogen atom, Y denotes a halogen atom or OR.sup.2, R.sup.2 denotes a hydrogen atom or a protecting group of a carboxyl group, and Y.sup.2 denotes OR.sup.3 or SR.sup.4 in which R.sup.3 denotes a hydrogen atom, a protecting group of a carboxyl group or an ester residue and R.sup.4 denotes an ester residue.
    Type: Grant
    Filed: July 10, 1991
    Date of Patent: September 22, 1992
    Assignee: Mercian Corporation
    Inventors: Takeo Yoshioka, Ryoichi Miyata, Toshio Tsuchida, Hiroshi Tone, Rokuro Okamoto
  • Anthracycline derivatives
    Patent number: 4997922
    Abstract: 14-Trifluoromethanesulfonyloxydaunomycin represented by the following formula ##STR1## and its salt. This compound is useful as an intermediate for production of adriamycin.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: March 5, 1991
    Assignee: Sanraku Incorporated
    Inventors: Takeo Yoshioka, Toshio Tsuchida, Ryoichi Miyata, Hiroshi Tone, Rokuro Okamoto