Patents Assigned to Hiroaki Takayada
  • Novel vitamin D.sub.3 derivative and process for preparing the same
    Patent number: 4284577
    Abstract: A novel vitamin D.sub.3 derivative of the formula ##STR1## (wherein R.sub.1 is hydrogen or a hydroxyl group) which exhibits strong biological activity like that of vitamin D and is useful as a medicine; and a process for producing the same are disclosed.
    Type: Grant
    Filed: February 7, 1980
    Date of Patent: August 18, 1981
    Assignees: Sachiko Yamada, Hiroaki Takayada
    Inventors: Sachiko Yamada, Masayuki Ohmori, Hiroaki Takayama