Granted Patent
Utility
US 4,818,818 · App. 06/925,774
Method for the preparation of 4'-0-tetrahydropyranyladriamycin b
Inventors:
Hamao Umezawa, Tomio Takeuchi, Kuniaki Tatsuta, Yoshikazu Takahashi
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Oct 30, 1986
Inventors
Hamao Umezawa
Tomio Takeuchi
Kuniaki Tatsuta
Yoshikazu Takahashi
Assignee (at issue)
Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.