Patents Assigned to Hidehiko Watanabe
  • Aspartic acid derivatives
    Patent number: 4962225
    Abstract: New aspartic acid derivatives include N-.alpha.-t-butoxycarbonyl-aspartic acid-.beta.-2-adamantyl ester-.alpha.-benzyl ester, N-.alpha.-t-butoxycarbonyl-aspartic acid-.beta.-2-adamantyl ester and benzyloxycarbonyl-aspartic acid-.beta.-2-adamantyl ester-.alpha.-benzyl ester.
    Type: Grant
    Filed: April 1, 1988
    Date of Patent: October 9, 1990
    Assignee: Hidehiko Watanabe
    Inventors: Yoshio Okada, Koichi Kawasaki, Shin Iguchi