Patents by Inventor Kuniaki Tatsuta

Kuniaki Tatsuta 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).

  • Antitumor anthracycline antibiotics
    Patent number: 4303785
    Abstract: New anthracycline derivatives of adriamycin and daunomycin prepared by the etherification of the C-4' and/or C-14 hydroxyl groups of the starting material glycosides are found to be useful antimicrobial and antitumor agents.
    Type: Grant
    Filed: January 31, 1980
    Date of Patent: December 1, 1981
    Assignee: Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai
    Inventors: Hamao Umezawa, Tomio Takeuchi, Hiroshi Naganawa, Kuniaki Tatsuta
  • Novel macrolactone derivatives and process of producing them
    Patent number: 4255564
    Abstract: By protecting the aldehyde group of a macrolide series antibiotics with a cyclic acetal or thioacetal, novel macrolide derivatives can be produced from the macrolide series antibiotics by releasing successively, the sugar moieties bonded to the macrolide antibiotics.The novel marcolide derivatives obtained by this invention, that is, the derivatives of a macrolide series antibiotics produced by releasing partially or wholly the sugar moieties bonded are useful as intermediates for producing novel macrolide series antibiotics.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: March 10, 1981
    Assignee: Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai
    Inventors: Sumio Umezawa, Hamao Umezawa, Kuniaki Tatsuta
  • Novel macrolactone derivatives and process of producing them
    Patent number: 4196280
    Abstract: By protecting the aldehyde group of a macrolide series antibiotics with a cyclic acetal or thioacetal, novel macrolide derivatives can be produced from the macrolide series antibiotics by releasing successively, the sugar moieties bonded to the macrolide antibiotics.The novel macrolide derivatives obtained by this invention, that is, the derivatives of a macrolide series antibiotics produced by releasing partially or wholly the sugar moieties bonded are useful as intermediates for producing novel macrolide series antibiotics.
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: April 1, 1980
    Assignee: Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai
    Inventors: Sumio Umezawa, Hamao Umezawa, Kuniaki Tatsuta