Granted Patent
Utility
US 5,352,789 · App. 08/022,091
Methods for purifying camptothecin compounds
Inventor:
Hellmuth R. Hinz
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Feb 25, 1993
Inventor
Hellmuth R. Hinz
Assignee (at issue)
The Stehlin Foundation for Cancer Research
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.